LOL! Celebrities Photobombing Other Celebs

Credit: Vince Bucci/Getty

What upgrades a photobomb from funny to freaking hilarious? When the pic involves a celebrity bombing a fellow A-lister, whether on purpose or unintentionally.

Case in point: Catherine Zeta-Jones and Angelina Jolie struck an oblivious pose while a goofy Michael Douglas mugged in the background at the Golden Globes in Beverly Hill on January 2011.

Click through the photos to see Nicole Kidman bomb Meryl Streep (it's so creepy!), Justin Bieber getting between Russell Brand and Katy Perry and many more.