20 Celebs You Didn't Realize Guest-Starred on 'Friends'!

Friends may have launched the careers of Jennifer Aniston, Courteney Cox, Lisa Kudrow, Matt LeBlanc, Matthew Perry, and David Schwimmer – but it also featured a lot of other celebrities!

Several big name stars from Paul Rudd to Bruce Willis to Cole Sprouse all had recurring roles on the shows – but tons of other stars had one of the first big TV breaks on the hit show.

Make sure you check out HBO Max’s upcoming Friends reunion special! You can find out when it will be debuting on the streaming site here.

Click through the slideshow to see the 20 stars we bet you totally forgot were on Friends…