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(CNN) - It's been 25 years since “Friends” was released, and their fans are still watching reps of the series over and over again.
The successful 90s comedy would not be complete without all the cameos made by some of Hollywood's biggest stars over the years.
Here are 10 that appeared in "Friends."
Brad Pitt
In an episode of the eighth season, Monica meets former high school classmate Will Colbert, played by Brad Pitt (then married to Jennifer Aniston, who played Rachel Green). Monica invites you to the group's Thanksgiving dinner.
It turns out that Will has a long-standing grudge against Rachel, and reveals at the table that he was the co-founder of the club "I hate Rachel Green," along with Ross.
Reese witherspoon
Reese Witherspoon makes two appearances in the sixth season as Rachel's younger sister, Jill.
She appears for the first time at the door of Monica's apartment after being financially isolated by her father, and finally becomes entangled in the drama "will they do it or not?" Between Rachel and Ross.
Billy Crystal and Robin Williams
What do you get when two of the most important names in the comedy approach the set of "Friends"?
This completely improvised scene, with Billy Crystal and Robin Williams.
Crystal and Williams were close while filming an episode of the third season. The writers asked them if they would be willing to appear and they accepted.
Billy Crystal and Robin Williams play friends with Tomas and Tim. Monica is interrupted while she tries to tell a story and asks the rest of the group to make room on the orange sofa in Central Perk. The ridiculous conversation between the two gains prominence to whatever Monica wanted to share.
Winona Ryder
In the seventh season, Winona Ryder played Melissa Warburton, the former sister of Rachel's university, sorry Ray Ray, with whom Rachel once shared a kiss.
Bruce Willis
Remember when Ross dated his (much younger) student Elizabeth Stevens in the sixth season?
Bruce Willis made a cameo like Paul Stevens, Elizabeth's father, who quickly makes it clear that he is not happy with Ross's relationship with his daughter.
Susan Sarandon
In the seventh season, Susan Sarandon played Cecilia Monroe, a soap opera actress who gives Joey advice on playing her character in the "Days of Our Lives" program.
Tom Selleck
Before Monica and Chandler, there were Monica and Richard, and he played it no less than Tom Selleck.
Danny DeVito
Who could forget Danny DeVito as Agent Goodbody, the stripper Rachel and Monica reserved at the last minute for Phoebe's bachelorette party?
Sean Penn
Sean Penn's cameo came during season 8. The actor played Eric, who was engaged to Phoebe's twin sister, Ursula.
Phoebe soon discovers that Ursula has lied to Eric to be with him, and things take a turn.
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