NEW YORK, NY - OCTOBER 31: Miranda Kerr hosts the Sexy Circus Halloween Party at Catch Rooftop on October 31, 2011 in New York City. (Photo by Jerritt Clark/WireImage)
Christina Aguilera and Jordan Bratman (Photo by Denise Truscello/WireImage)
Paris Hilton as Miley Cyrus Halloween at the Roosevelt Hotel in Hollywood, California on October 26, 2013.
Actress Anne Hathaway, dressed as Cleopatra, attends Heidi Klum's 5th Annual Halloween party at Marquee October 31, 2004 in New York City. (Photo by Evan Agostini/Getty Images)
Lily Allen is seen leaving the UNICEF Halloween ball, held at 1 Mayfair on October 31, 2013 in London, England. (Photo by Niki Nikolova/FilmMagic)
Demi Lovato as a skeleton.
Matt Lauer dresses as Pam Anderson's character from "Baywatch" on NBC's "Today" Halloween show on Thursday, Oct. 31, 2013 in New York.
It's hard to recognize these actresses with their fishermen costumes.
Host Kenan Thompson speaks on stage at "Hub Network's First Annual Halloween Bash" on Sunday, Oct. 20, 2013, at the Barker Hanger in Santa Monica, Calif. The star-studded special will be broadcasted on the Hub Network on Saturday Oct. 26, 2013. (Photo by Jordan Strauss/Invision for the Hub Network/AP Images)
Kathie Lee Gifford, left, and Hoda Kotb dress as Wilma and Betty from the "Flintstones" on NBC's "Today" Halloween show on Thursday, Oct. 31, 2013 in New York. (Photo by Charles Sykes/Invision/AP)
Derek Hough attends Treats! Magazine's 3rd Annual Trick or Treats! Halloween Party presented by Jose Cuervo on Thursday, Oct. 31, 2013 in Los Angeles. (Photo by Todd Williamson/Invision for Jose Cuervo/AP Images)
Paris Hilton attends Treats! Magazine's 3rd Annual Trick or Treats! Halloween Party presented by Jose Cuervo on Thursday, October 31, 2013 in Los Angeles.
Gwen Stefanie was a pretty princess for Halloween 2013.
Coco Austin and Ice T attend Heidi Klum's 14th annual Halloween party on Thursday, Oct. 31, 2013 in New York. (Photo by Charles Sykes/Invision/AP)
Miley Cyrus as Lil Kim at the 1999 VMAs.
Jenni "JWoww" Farley, left, and Nicole "Snooki" Polizzi attend Night of the Living Drag: A RuPaul's Drag Race Halloween party on Friday, Oct. 25, 2013 in New York. (Photo by Charles Sykes/Invision/AP)
WEST HOLLYWOOD, CA - OCTOBER 31: Singer/actress Demi Lovato attends her Halloween Party at the PhilyMack Management Building on October 31, 2013 in West Hollywood, California. (Photo by Christopher Polk/Getty Images for Philymack)
Beyonce as an angel.
Billy Gardell as Frankenstein and Melissa McCarthy as bride of Frankenstein.
Naya Rivera as Carmen Sandiego.
NEW YORK - OCTOBER 30: Nick Cannon and Mariah Carey attend a Halloween party at Marquee on October 30, 2008 in New York City. (Photo by Johnny Nunez/WireImage)
Rumer Willis as a leopard.
Perez Hilton attends Heidi Klum's 14th annual Halloween party on Thursday, Oct. 31, 2013 in New York. (Photo by Charles Sykes/Invision/AP)
Gisele Bündchen and Tom Brady as Dorothy and the Lion from "The Wizard of Oz."
Kim Kardashian, dressed in a Little Red Riding Hood costume, arrives at Heidi Klumâs Halloween Party in New York, Sunday, Oct. 31, 2010. (AP Photo/Charles Sykes)
Actors Austin Nichols and Sophia Bush attend Maroon 5's Halloween Bash presented by Bacardi at Hollywood Forever Cemetery on October 31, 2010 in Hollywood, California.
LOS ANGELES, CA - OCTOBER 28: 90210 starlet, Shenae Grimes, dressed as Monster High's Frankie Stein, leaves for Matthew Morrison's 3rd Annual Halloween Party on October 28, 2012 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for Mattel)
Ellen DeGeneres as Nicki Minaj.
Neil Patrick Harris and David Burtka as Tweedle Dee and Tweedle Dum and their twins Harper and Gideon as Alice and the White Rabbit.
Lauren Conrad arrives for the Pur Jeans Halloween Bash in Los Angeles, Friday, Oct. 31, 2008. (AP Photo/Chris Pizzello)
Kelly Osbourne as Dame Edna.
Jay Manuel attends Heidi Klum's 14th annual Halloween party on Thursday, Oct. 31, 2013 in New York. (Photo by Charles Sykes/Invision/AP)
Miley Cyrus as Nicki Minaj.
Kelly Osbourne as Christina Hendricks.
Jennifer Lopez & Casper Smart as hippies.
NEW YORK - OCTOBER 30: Singer Mariah Carey and actor Nick Cannon attend their Halloween Eve Costume Party at Marquee on October 30, 2008 in New York City. (Photo by Stephen Lovekin/WireImage for Syndicate)
HOLLYWOOD, CA - OCTOBER 31: Comedian/actor Aziz Ansari attends Bacardi and Maroon 5's Annual Halloween Bash held at Hollywood Forever Cemetary on October 31, 2011 in Hollywood, California. (Photo by Charley Gallay/WireImage)
Miley Cyrus as Lil Kim, Snoop Dogg as Jigsaw, and Paris Hilton as a cat.
Aaron Paul (right) and wife Lauren Parsekian attend Treats! Magazine's 3rd Annual Trick or Treats! Halloween Party presented by Jose Cuervo on Thursday, October 31, 2013 in Los Angeles. (Photo by Todd Williamson/Invision for Jose Cuervo/Ap Images)
Khloe Kardashian, left, and Christina Milian pose together at the Pur Jeans Halloween Bash in Los Angeles, Friday, Oct. 31, 2008. (AP Photo/Chris Pizzello)
WHIPPANY, NJ - OCTOBER 24: (EXCLUSIVE ACCESS, SPECIAL RATES APPLY) Television personality Nicole 'Snooki' Polizzi, Jionni Lavalle and their son Lorenzo Lavalle celebrate Halloween in their costumes from Rubies Costume Company on October 24, 2013 in Whippany, New Jersey. (Photo by Jamie McCarthy/NEP/Getty Images for Hired Gun Publicity & Consulting)
MIAMI BEACH, FL - OCTOBER 31: Kim Kardashian and Kanye West arrive at Kim Kardashian's Halloween party at LIV nightclub at Fontainebleau Miami on October 31, 2012 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images)
Alyssa Milano during 7th Annual Heidi Klum Halloween Party, Sponsored by M&M's Dark Chocolate - Arrivals at Privilege in Los Angeles, California, United States. (Photo by Jon Kopaloff/FilmMagic)
In this photo provided by Warner Bros., talk show host Ellen DeGeneres, left, reveals her Halloween costume in the likeness of actress Sofia Vergara, right, during the taping of "The Ellen DeGeneres Show" on Tuesday, Oct. 30, 2012, in Burbank, Calif. The special Halloween episode airs on Wednesday. (AP Photo/Warner Bros., Michael Rozman)
Adam Brody, Rachel Bilson, Josh Schwartz and Melinda Clarke at the SKYY Orange Party (Photo by J.Sciulli/WireImage for The Rose Group)
HOLLYWOOD - OCTOBER 31: Television personality Audrina Patridge attends Halloween 2008 At The Roosevelt Hotel on October 31, 2008 in Hollywood, California. (Photo by Chelsea Lauren/Getty Images)
Neil Patrick Harris and David Burtka as vampires.
SANTA MONICA, CA - OCTOBER 30: Busy Philipps and daughter Birdie Leigh Silverstein arrive at the 17th Annual Dream Halloween event at Barker Hangar on October 30, 2010 in Santa Monica, California. (Photo by Gregg DeGuire/FilmMagic)
Martha Stewart arrives at "Hub Network's First Annual Halloween Bash" on Sunday, Oct. 20, 2013, at the Barker Hanger in Santa Monica, Calif. The star-studded special will be broadcasted on the Hub Network on Saturday Oct. 26, 2013. (Photo by Jordan Strauss/Invision for the Hub/AP Images)
LAS VEGAS - OCTOBER 31: Actor Kellan Lutz (L) and actress Ashley Greene from the 'Twilight' movie series arrive at Veuve Clicquot's Yelloween at the Tao Nightclub at the Venetian Resort Hotel Casino October 31, 2009 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)
Heidi Klum attends the 2013 Heidi Klum Halloween Party dressed as an elderly woman, at Marquee on October 31, 2013 in New York City. (Photo by Andrew Toth/FilmMagic)
Iggy Azalea dressed as Cruella de Vil attends the VEVO Halloween showcase at The Oval Space on October 31, 2013 in London, England. (Photo by Gareth Cattermole/Getty Images)
Model Alessandra Ambrosio, dressed as the Queen Of Hearts, attends the Casamigos Halloween Party at the home of Mike Meldman on October 25, 2013 in Beverly Hills, California. (Photo by Jerod Harris/Getty Images)
Chloe Moretz sighting on October 31, 2012 in London, England. (Photo by Niki Nikolova/FilmMagic)
Kim Kardashian, dressed as Poison Ivy, attends the Midori Green Halloween costume party at Lavo on October 29, 2011 in New York City. (Photo by Rob Kim/FilmMagic)
Scott Disick (dressed as Robin) and Kourtney Kardashian (Dressed As Batman) arrive at Kim Kardashian's Halloween party at LIV nightclub at Fontainebleau Miami on October 31, 2012 in Miami Beach, Florida. (Photo by John Parra/WireImage)
Singer Pink, dressed as a clown, arrives at Heidi Klum's 2008 annual Halloween party at 1OAK on October 31, 2008 in New York City. (Photo by Charles Eshelman/FilmMagic)
Bethenny Frankel, dressed as Marilyn Monroe, attends Heidi Klum's Halloween presented by Shutterfly at Marquee on October 31, 2013 in New York City. (Photo by Andrew H. Walker/Getty Images for Shutterfly)
Actress Dascha Polanco, dressed as the Black Swan, attends Shutterfly Presents Heidi Klum's 14th Annual Halloween Party sponsored by SVEDKA Vodka and smartwater at Marquee on October 31, 2013 in New York City. (Photo by Cindy Ord/Getty Images for Heidi Klum)
Stylist June Ambrose, dressed as Queen Elizabeth, attends the 2013 Heidi Klum Halloween Party at Marquee on October 31, 2013 in New York City. (Photo by Andrew Toth/FilmMagic)
Model Shanina Shaik, dressed as Princess Jasmine attends the 2013 Heidi Klum Halloween Party at Marquee on October 31, 2013 in New York City. (Photo by Andrew Toth/FilmMagic)
Alexa Chung, dressed as Marie Antoinette, attends the Browns Focus Halloween party hosted by Alexa Chung at St Banabas House in Soho on October 31, 2008 in London, England. (Photo by Dave M. Benett/Getty Images)
Dressed as sexy Elvira and a ghastly ghoul
Heidi Klum arrives at her 12th Annual Halloween Party in Las Vegas. (2011)
Actress Michelle Trachtenberg attends Heidi Klum's annual Halloween party at the Dream Hotel on Monday, Oct. 31, 2011 in New York. (AP Photo/Evan Agostini)
Singer Stacy "Fergie" Ferguson attends Heidi Klum's annual Halloween party at the Dream Hotel on Monday, Oct. 31, 2011 in New York. (AP Photo/Evan Agostini)
Heidi Klum, dressed as Cleopatra, attends her Haunted Holiday Party benefiting Superstorm Sandy relief efforts, on Saturday, Dec. 1, 2012 in New York. Klum's original party, scheduled to be held on Halloween, was postponed due to the storm. (Photo by Charles Sykes/Invision/AP)
Model and television personality Heidi Klum, left, and husband Seal attend Heidi Klum's annual Halloween party at the Dream Hotel on Monday, Oct. 31, 2011 in New York. (AP Photo/Evan Agostini)
Kim Kardashian attends 2nd Annual Midori Green Halloween Party at Avenue on October 27, 2012 in New York City dressed as a mermaid.
Katy Perry as Jane Lane and Shannon Woodward as Daria.
Model Kate Upton attends Heidi Klum's annual Halloween party at the Dream Hotel on Monday, Oct. 31, 2011 in New York. (AP Photo/Evan Agostini)
"HAPPY HALLOWEEN!! Me and Mariska starting the night!! #boo," the "Smash" star tweeted Wednesday.
Darren Criss is a boy scout and probably a big fan of "Moonrise Kingdom."
We never thought we'd say it, but the "Jersey Shore" star and her fiancé positively geeked it out.
No sleight of hand here. Christina Milian is the Queen of Hearts.
George Clooney's girlfriend is "Black Swan."
Pop starlet Miley Cyrus' mum and sister Tish Cyrus and Brandi Cyrus are all dressed up for Halloween as they head to the Roosevelt hotel for a party in Hollywood.
Sacha Baron Cohen donned a bizarre monkey-cow costume.
P. Diddy rocked out at the Playboy Mansion Halloween Party in Beverly Hills, California on October 27th, 2012.
Brandon Davis at the Playboy Mansion Halloween Party in Beverly Hills, California on October 27th, 2012.
Lucy Hale as a unicorn.
In this Image released by Mattel, actress Shenae Grimes, from the series "90210", left, has a fitting of her Monster High Frankie Stein Halloween costume created by "Project Runway" alum Chris March, Wednesday, Oct. 17, 2012, in El Segundo, Calif. Grimes will be attending "Glee" cast member Matthew Morrison's 3rd Annual Halloween Bash, dressed as Frankie Stein, daughter of Frankenstein, from the popular Monster High franchise. This year, the popular Halloween party will be sponsored by Monster High. (AP Photo/Mattel, Rene Macura)
Heidi Klum gets fitted for her 13th annual Halloween party at finale sponsored by HobNob Wines, Svedka Vodka And Smartwater on September 3, 2012 in New York City.
Sarah Hyland as Spinelli from "Recess."
Nicole Scherzinger as a vampire.
Kim Kardashian as a leopard.
Holly Madison as Sleeping Beauty.
Fergie as Lindsay Lohan.
Christina Milian as Sulley.
Fergie & Josh Duhamel as Angelyne & Dennis Woodruff.
Christina Aguilera as ???
Paris Hilton as Alice.
Kris Jenner as Wonder Woman.
Ashley Benson as Tweedle Dee (or Dumb).
Hugh Hefner as a vampire.
Holly Madison as the Cheshire Cat.
Hilary Duff in a Día de los Muertos costume.
Kim Kardashian as Kris Jenner.
Fergie as a sexy cat.
Bonnie & Clyde
Julie Bowen as a scary Bo Peep.
Genevieve Jones & Nicky Hilton as a KISS member and a leopard.
Adam Lambert as a vampire.
Bella Thorne as a vampire bride.
Liam Payne as Batman.
Shanae Grimes as a skeleton.
Scott Disick as Patrick Bateman.
Nicole Richie and friends as Wilderness Girls from "Troop Beverly Hill."
Bill Murray backstage during the Crossroads Guitar Festival in Bridgeview, Illinois. (2010)
Designer Roberto Cavalli attends his Halloween Party at Cipriani's in New York City. (2007)
Actor Pierce Brosnan attends Allison Sarofim's Halloween Party. (2010)
Marc Jacobs (left) and Valentino Garavani attend Allison Sarofim's 80s-themed Halloween party. (2009)
We're assuming that this guy was attempting to take an underwater selfie.
He does not approve.
His night vision is perfect for interrupting hipster photo shoots.
He stood on that pinecone to get in this photo: commitment.
"Sorry, did I ruin your postcard?"
Still part of the family.
Maybe planned, still terrific.
"My husband and I were taking our border collie, Jack, out for his daily beach run and play. (This) is the photo of him being photobombed. I didn't see the dog until I saw it on the screen after the photo was taken."- Submitted By Laura Hancock
"I was trying to take a picture of this cute Waterbuck calf, when it's mom stepped in to see what I was doing to her baby...LOL." Submitted by: Karen Stephens
"I was taking a picture of my cat Simon one day when Teddy got a bit jealous (like he always does). Hope you enjoy!" Submitted by: Hali Jakeman
Submitted by: Karen Lyons Kalmenson
In our experience cats really do hate driving.
This dog is huge!
Where was this cat standing?
Submitted By: Kylee Callahan
"Here is Badger, completely unaware of his archenemy Groucho doing the bombing..." -Submitted By: Kimberly Rai Cook
Submitted By: Heather Smith Robitzek
Submitted By: Christopher Guignon
Hey! Me too, right?
Submitted By: Alan Kelly
"Photobomb of my dachshund with my then 3-month-old daughter." -Submitted By: Melanie Walsh
Submitted By: Jean Seraichyk
This goat would clearly lose hide-and-seek.
That cat takes itself way too seriously.
"I was taking head shots for a friend when Albert kept entering the frame and posing. This is the shot when my friend had had enough." - Submitted By: KathlynHoran
These cows would have been such a good background otherwise.
"My husky is pretty angry she's not included in the picture." -Submitted By: Kimberly Fernandez
Submitted By: Marcelle Gonzalez
Submitted By: Jenny Haniver
Submitted By: Ren Meier
"An animal photobomb taken in the "off leash" portion of Austin's Town Lake hike and bike trail. This is actually our dog, presumably telling us how she really feels about the new baby!" -Submitted By: Joanna
Just wait for it.
"I make this look easy."
The lion doesn't even know he is posing, he's just naturally suave.
This dolphin really deserves credit for making this picture great.
"Dog park fun (Jack, Marley, and Kiana) getting their picture taken when a great dane decides to make a cameo!!" -Submitted By: Brynn Fesler
"I'm part of the family too. Why shouldn't I be in the picture?"
"Another animal is getting more attention than me!"
Maybe this was planned?
"Oh, you were taking a picture?"
Just a man, a woman, and their horse.
Even dogs can enjoy 3D.
The photographer is holding a steak.
This donkey has a place to go.
Quick window bomb before flying away.
Just gonna sneak in here.
Cool boat, dude.
Pretty scenic, huh?
Bet he didn't see that coming.
Is this cute or just incredibly creepy?
Nope, FCC cat doesn't approve of this.
Get a room.
He knew what he was doing.
Sweet picture, dude.
This probably ended well.
Don't get out of the car.
That couch looks pretty comfy.
Dude, pipe down over there.
What's he planning?
When you gotta go, you gotta go.
Up close and personal.
You're never too young to get photobombed.
C'mon, ditch the girl and come play with this ball.
Not just any goat bomb, but a sarcastic goat bomb.