1.Britney Spears shared this classic photo of herself taken by Ellen von Unwerth in 2003:
2.In honor of Lenny Kravitz's 57th birthday, Zoë Kravitz shared this Polaroid of him in the late '80s:
3.While Cyndi Lauper posted this photo of herself with Lenny — along with LL Cool J and Sean Ono Lennon — in 1991:
4.John Stamos shared this photo from the taping of the Full House finale in 1995:
5.Sofía Vergara posted this '90s TBT photo that featured that one high heel chair that everyone wanted (or at least that was so cool at the time):
6.Janet Jackson shared this photo of herself and Johnny Gill in the late '80s in honor of his 55th birthday:
7.Eva Mendes shared this photo of herself and Ryan Gosling from their 2012 film, The Place Beyond the Pines:
8.Gwen Stefani shared this photo of herself taken in the early '00s:
9.Naomi Campbell celebrated her 51st birthday by sharing her adorable baby photo:
10.Danny Trejo shared the poster for his 2010 film Machete — which also happens to be the first movie where he was the lead:
11.Ludacris posted these pics of himself, Diddy, and Jay-Z, which were taken in TRL's iconic photo booth:
12.Drew Barrymore celebrated going live on IG with her BFF Cameron Diaz by sharing these photos of the two of them (and Lucy Liu, too!) from throughout the years:
13.Halle Berry posted this clip of herself as Sharon Stone in The Flintstones, in honor of the movie's 27th anniversary:
14.Elizabeth Banks threw it back to this classic scene from Wet Hot American Summer — just ahead of the film's 20th anniversary:
15.Mark Hamill shared these awesome behind-the-scenes video clips of himself, Carrie Fisher, and Harrison Ford on the set of Return of the Jedi:
16.Jenna Fischer posted this classic scene from The Office — where Jim proposes to Pam — because she and Angela Kinsey revealed some behind-the-scenes info on it in the latest episode of the Office Ladies podcast:
18.And finally, in celebration of the Friends reunion airing on HBO Max tonight, Jennifer Aniston posted this video of herself being interviewed about the then-new show in 1994: