1. Mindy Kaling shared this photo of herself in high school in the late '90s:
2. Cindy Crawford also had high school on the mind and posted this photo of herself (on the far right, second row from the bottom) from her '80s cheerleader days:
3. Kelly Ripa shared this photo of herself and her husband, Mark Consuelos, back in 2007:
4. Diana Ross posted this clip from her No. 1 single, "Theme from Mahogany (Do You Know Where You're Going To)," which was off her hit film, Mahogany:
5. Shania Twain shared these behind-the-scenes photos taken on the set of her iconic 1999 music video for "Man! I Feel Like A Woman!"
6. In honor of her induction into the Rock & Roll Hall of Fame, Stevie Nicks posted this clip that highlights her legendary career:
7. Courteney Cox shared this photo of herself meeting Sting in the '80s:
8. Michelle Pfeiffer posted an adorable photo of herself in the late '50s:
9. Bianca Del Rio remembered when she (iconically) played Judge Judy during "Snatch Game" on RuPaul's Drag Race Season 6 back in 2014:
10. Barbra Streisand shared this photo of herself and her son, Jason, on the set of her 1976 film, A Star Is Born:
11. Vampire Weekend's Ezra Koenig posted this photo of himself performing at the Leeds Festival in 2014:
12. Lenny Kravitz shared this photo of himself hanging out backstage at a concert with Metallica's Kirk Hammett in 1993:
13. Ronan Farrow posted this photo from when he was a senior in college in 2003:
14. Gwen Stefani shared this photoshopped photo of herself and boyfriend, Blake Shelton, together as teenagers:
15. Mandy Moore posted this photo from when she walked in a Tommy Hilfiger charity runway show in 2000:
16. Kim Kardashian shared this photo of herself with her grandfather in the '80s:
17. And finally, Steven Tyler won #TBT with this photo of himself in the '70s, that was also captioned with an A+++ caption:
BABY... I *INVENTED* STANNING A SKINNY LEGEND!! 👏🏼👏🏼👏🏼 #TBT