1. Sarah Michelle Gellar shared this photo of her and Seth Green from long before their Buffy days.
Sarah Michelle Gellar / Via instagram.com
2. January Jones threw it back to her days as Betty Draper on Mad Men.
January Jones / Via instagram.com
3. Barbra Streisand shared this photo of herself performing in Las Vegas in 1969.
Barbra Streisand / Via instagram.com
4. Salma Hayek posted this '90s photo of herself with her goddaughter.
Salma Hayek / Via instagram.com
5. Alyssa Milano remembered when she co-starred with Arnold Schwarzenegger in 1985's Commando.
Via instagram.com
6. Dita Von Teese shared this glam pinup from her early days.
7. Pee-wee Herman shared this photo of himself and Eddie Murphy at the premiere of Pee-wee's Big Adventure.
8. In honor of her grandma M.J.'s birthday, Kim Kardashian shared this cute photo of herself and Kourtney hanging out with her in the '80s.
Kim Kardashian / Via instagram.com
9. And finally, Mia Farrow posted this photo of her and son Ronan meeting Hillary Clinton back in the early '90s.
