1. Madonna posted a collage of her early '80s Downtown NYC friends: Keith Haring, Andy Warhol, and Jean-Michel Basquiat.
2. Mia Farrow took us back to her Peyton Place days, when she had a crush on her co-star, Ryan O'Neal.
I don't think @Ryan_O_Neal knew I had such a painful crush on him - when we were making #PeytonPlace #tbt
3. Naomi Campbell shared this photo of her and Tyson Beckford modeling in the '90s.
4. Rob Lowe remembered a ski trip he took in the late '80s.
5. Alicia Keys posted this photo of when she and Lenny Kravitz performed together at the Keep a Child Alive Ball in 2004.
6. Nick Jonas posted this adorable pic in hopes of getting some votes for the Favorite Male Artist award at the AMAs.
Throwback me thinks you should vote for me for the AMAs 😏#tbt
7. Speaking of adorable, Khloé Kardashian shared this cute pic of herself in a bubble bath.
#TBT I’ve always loved a good soak in the tub!!! https://t.co/4JWmdy7q43
8. Kendall Jenner looked back to her sporty days.
#TBT me as a Gap baseball player?
9. And finally, Tracee Ellis Ross proved that she might have had the coolest 18th birthday ever 'cause she got to celebrate it with icons Iman and Grace Jones.
#tbt hanging out with @the_real_iman and @miss_gracejones on my 18th birthday!