1. Paul McCartney shared this photo of him and Michael Jackson recording their 1983 Billboard No. 1 hit, "Say Say Say."
Paul with @MichaelJackson #ThrowbackThursday #TBT Watch the video for #SaySaySay 2015 Remix: http://t.co/bV3NhQDdrX
2. Chris Pratt shared this cute school photo of his 13-year-old self.
3. Speaking of cute, here is Cristiano Ronaldo's school photo from 1993.
4. Also taking us back to the '90s was Mariah Carey, who shared this pic of herself from 1994.
5. Ewan McGregor remembered the first car he ever owned.
6. Anderson Cooper shared this photo from his pre-silver fox days.
7. Madonna remembered when she first visited Japan.
8. William Levy posted this pic that looks straight out of an early '00s Abercrombie & Fitch catalog.
#tbt love you all!!
9. Venus Williams shared this adorable photo of her and dad on the tennis court in 1991.
#TBT 1991, Compton, with Dad #tennis #coaching
10. Amy Schumer was also feeling the dad love in her #TBT.
11. Gillian Anderson got us excited about the X-Files reboot by sharing this fun publicity photo from 20 years ago.
Woohoo! Ep 1001 kicked a** at MIPCOM! Sorry @davidduchovny, I know you hate this pic but couldn't help myself! #tbt
12. Diddy took us back to the time that Rolling Stone magazine named him "The New King of Hip-Hop" in 1997.
#TBT #DREAMBIG #LetsGO @RollingStone
13. Mia Farrow shared this lovely photo of herself from the 1960s.
Good morning #TBT