1. John Stamos shared this photo of himself with an adorable (and very young) Elizabeth Olsen.
2. Kellan Lutz posted a funny photo of him and his brother rocking almost-matching shirts and spiky hair.
3. Amy Sedaris posted this late '90s photo of herself with her Strangers With Candy co-stars Paul Dinello and Stephen Colbert.
4. Madonna posted this '80s pic of herself playing the ukulele to a bunch of guys ¯\_(ツ)_/¯.
5. Kylie Minogue shared this stunning photo of herself taken in 1991.
6. Cindy Crawford got in a summer mood with her #TBT.
7. Carrie Brownstein shared this too cute photo of herself as a kid having fun at the fair.
8. Ozzy Osbourne posted this #TBT in honor of MTV's 35th anniversary.
9. Chris Hardwick (right) shared this photo of himself and his brother rocking some serious '70s bowl cuts.
10. Mayim Bialik posted this oh-so-late '80s photo of herself.
11. Gillian Anderson shared this gorgeous photo of herself in her twenties.
12. Sarah Michelle Gellar remembered the time she hung out backstage at SNL with Florence Henderson and Gina Gershon.
