1. Robert Downey Jr. posted this photo of him and Brooke Shields on the set of their 1999 film, Black & White, where they looked like they played candy ravers.
From the great hair gel shortage of '93... #TBT
2. Mandy Moore took us back to 2000, when she hosted MTV's Spring Break with Sisqó and Pink.
3. While Ashley Judd took us back 30 years, to when she went to her high school's homecoming dance.
My #TBT photo, Homecoming, 1985! Ashland High School (P Blazer).
4. Gwyneth Paltrow shared this sweet photo of herself with her father, Bruce.
5. Um, did Cindy Crawford once model in a Cabbage Patch Kids fashion show?
6. Speaking of modeling, Kylie Minogue once really worked a mirrored swimsuit (?) in the '80s.
7. Jenna Dewan-Tatum once gave a whole lot of denim and fringe in her elementary school photo.
Last throwback goes to when I couldn't get enough fringe. #tbt
8. Guy Ritchie looked back on when he directed Brad Pitt in Snatch.
He didn't do so well as a boxer, but he's still cracked on. #TBT #Snatch
9. Heidi Klum posted this cute photo of herself as a kid.
#TBT me at school/ On #IWD2015 Stand #UpForSchool to empower next generation of women:Join us http://t.co/xWiWVFcvmR
10. Speaking of cute, check out Ludacris' elementary school photo.
#TBT Young Luda! #LudaversalMarch31st
11. LOL, Colton Haynes proudly rocked cargo army shorts while making a commercial in the early '00s.
12. Kelly Clarkson looked back on her epic film From Justin to Kelly.
#tbt to the best movie ever #fromjustintokelly #moveovermeryl #timeless