Celebrities are constantly being photographed, even when they don't want to be, and even when they are unaware.
Any star-studded events are far from being predictable, but there is one thing that is practically guaranteed, photobombs!
Here are ten hilarious celebrity photobombs of all time.
When you observe this picture, you first see Angelina Jolie looking radiant, then you see the comical Jack Black looking creepy in the background.
Vanessa Hudgens looks like she is try to take a silly picture, Zac Efron spotted the opportunity to make the photo even better.
Zach Braff intentionally photobombs Fergie and Jessica Alba as they smile, completely unaware.
Johnny Depp peeps out from behind a seemingly unaware Tim Burton.
Bill Clinton peeks out from behind a few rows of people and makes it into a photo with Kelly Clarkson.
George Harrison is posing with two lovely ladies and Paul McCartney ruins the moment in the background. Even the Beatles got on the photobombing fad.
This little bridesmaid has had enough and inadvertently ruins the royal couple's picture.
Tina Fey and Amy Poehler are best friends. We're sure Amy Poehler thinks Tina's photobomb is as great as we do.
Kelly Clarkson gets in on the photobombing trend herself when she poses in the background of Ellen Degeneres and Portia De Rossi's picture.
Michael Cera has been called "the king of photobombs" and in this photo, he does not disappoint. We're pretty sure he does not know these people.