1. Jennifer Aniston shared this oh-so-cute photo of herself looking pensively out a window in the early '70s:
2. Eva Mendes posted this photo of herself on Christmas morning in the early '80s:
3. Billie Joe Armstrong reposted this photo of himself in the '80s vs. him today:
4. Barbra Streisand shared this photo of herself in the studio during the recording of her album Butterfly, in 1974:
5. Natalie Portman remembered her 1996 film, Beautiful Girls:
6. Gillian Anderson posted this photo where she had NO idea what was going on:
Could somebody please tell me what’s going on here? #tbt
7. Lenny Kravitz shared this photo of himself performing in the early '90s:
8. Salma Hayek posted these photos that were part of a photoshoot taken in the '90s:
9. Marlo Thomas gave us a #TBT to her classic '60s TV series, That Girl:
10. Kerry Washington shared this photo of herself and Will Ferrell after they starred as The Jeffersons’ Helen and Tom Willis in Live in Front of a Studio Audience earlier this year:
11. Dolly Parton posted this photo of herself alongside her fellow country music legend and friend, Loretta Lynn, in the '70s:
12. And finally, Pitbull took it back to the bop-tastic song he and Kesha released in 2013, "Timber":
#TBT Timber https://t.co/uDLUkLj3uR