Another day, another prime photo-op ruined by a mischievous prankster.
The list of celebrities guilty of photobombing --that's jumping in on a shot uninvited -- continues to expand, as does that of stars who've had their own pictures ruined, either by a practical joker or an innocent background dweller.
Here are some of the most memorable celebrity photobombs.
Angelina Jolie, Jack Black, Dustin Hoffman
Portia DeRossi, Ellen DeGeneres, Kelly Clarkson
Miranda Kerr, Orlando Bloom, Jesse Tyler Ferguson
Amy Poehler, Tina Fey
Paul Giamatti, Thomas Haden Church, Sandra Oh
Russell Brand, Justin Bieber, Katy Perry
Justin Timberlake, Olivia Wilde
Rihanna, Chris Rock
Tim Burton, Johnny Depp
Kenny Ortega, Vanessa Hudgens and Monique Coleman
Selena Gomez, Justin Bieber
Paula Patton, Simon Pegg, Tom Cruise and Lea Seydoux
Meryl Streep, Russell Crowe
Catherine Zeta-Jones, Angelina Jolie
Aaron Sorkin, Jesse Eisenberg
Kim Kardashian, Nicki Minaj
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