15 "Friends" Guest Stars We Seriously Hope Make Surprise Appearances In The Reunion Special

You probably forgot some of them were even on the show.

Well, everyone, this is it! The Friends reunion is officially streaming on May 27 on HBO Max.

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Along with the official premiere date, a list of guest stars has also been released. On that list are some really popular names like Reese Witherspoon, BTS, Lady Gaga, David Beckham, and Justin Bieber.

Though we gotta ask...where are Paul Rudd and Cole Sprouse?!

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And now that's there's going to be a reunion, we can't help but wish that these other celebs who have guest-starred on Friends will make surprise cameos, too.

1. Julia Roberts

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In Season 2, Episode 13, Julia Roberts guest-starred as Susie Moss, a childhood friend of Chandler's who decides to prank date him as revenge for embarrassing her when they were younger.

2. Gary Oldman

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Sirius Black in Friends? Why, yes! For two episodes even! In Season 7, Gary Oldman played Joey's difficult but popular co-star in a World War I movie. And, believe it or not, he was nominated for an Emmy for his guest-starring role.

3. Charlie Sheen

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Charlie Sheen guest-starred in Season 3 as Ryan, Phoebe's long-lost old flame, who's a member of the US Navy and in town for a visit. They both end up with chickenpox but, well, they still had a lot of fun, cute moments throughout his stay.

4. Winona Ryder

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Remember that college sorority sister of Rachel's who called her "Ray-Ray"? And kissed her too? Yep, that's Winona Ryder, who appeared in the twentieth episode of the show's seventh season.

5. Anna Faris

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Appearing in a handful of episodes throughout Season 10, Anna Faris played the role of Erica, the birth mom of the twins Chandler and Monica intended on adopting.

6. Billy Crystal

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Billy Crystal made a cameo appearance in Season 3 along with Robin Williams, and the two played the comical Central Perk customers who kept interrupting Monica while she talked. And while it will never be the same without the late, great Robin Williams, it would be very nostalgic to see the other half of this trouble twosome again.

7. Bruce Willis

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At some point in Season 6, Ross begins dating a student. Rachel, on the other hand, eventually begins dating said student's father, Paul Stevens. Bruce Willis played the role of Paul for three episodes and earned himself an Emmy nomination.

8. Dakota Fanning

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Dakota Fanning guest-starred in Season 10 as a child named Mackenzie who befriends Joey during an open house as he tried to find something wrong with the new home Monica and Chandler bought. Wouldn't it be nice to see an all-grown-up Mackenzie in the reunion?

9. John Stamos

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When Chandler and Monica struggled to have children in Season 9, Chandler invited a clueless co-worker, played by John Stamos, to dinner with him and Monica because he believed he would make the perfect sperm donor.

10. Helen Hunt

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In a crossover with Mad About You, Helen Hunt plays her character Jamie Buchman, who mistakes Phoebe for her twin sister Ursula while at Central Perk. Since it's a crossover, Lisa Kudrow does appear in Mad About You as Ursula.

11. Sean Penn

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Speaking of Phoebe's twin sister, she was once engaged to a man named Eric, played by Sean Penn, who guest-starred in Season 8. Set out to right the wrongs of her twin sister, Phoebe actually ends up dating Eric a little but, well, that didn't really work out.

12. Christina Applegate

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While Reese Witherspoon, who plays the role of Rachel's sister, Jill, is on the guest list for the reunion, Rachel's other sister isn't. Christina Applegate plays Amy Green in seasons 9 and 10 and even won an Emmy for her role.

13. Jon Favreau

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Before becoming a Marvel star, Jon Favreau played the role of Pete Becker in six episodes of Season 3. Pete was Monica's ultra-rich boyfriend who wanted to be a mixed martial arts champion.

14. Ben Stiller

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Also in Season 3, Ben Stiller guest-starred as Tommy, Rachel's date who had temper problems and was referred to as "The Screamer."

15. And finally, Danny DeVito

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Where else can you find Danny DeVito playing a stripper? Why, on Friends, of course! Appearing in Season 10, Episode 11, Danny DeVito's stripper was hired for Phoebe's bachelorette party.