Gallery: Bet You Forgot These Celebs Once Guest-Starred On 'Friends'

Jennifer Aniston, Matthew Perry, Courteney Cox, Matt LeBlanc, David Schwimmer, and Lisa Kudrow are obviously the first names that pop into people's heads when they think of the Friends cast. 

But did you know that tons of your favorite celebs — including Julia Roberts, Reese Witherspoon, Ellen Pompeo, George Clooney, Brad Pitt, and even Dakota Fanning — all got their names in the credits over the course of Friends' 10-season run?

A few of these guest stars weren't major household names at the time; some might even say their careers were 🎶 stuck in second gear 🎶. But others — like ER's George Clooney — were already killin' it on their own hit TV shows. 

See if you can spot some familiar faces the next time you go on a Netflix binge (a la Jennifer Aniston herself). Here's a quick refresher courtesy Refinery29: