2. Even as a kid, Anderson Cooper knew the power of a smize.
3. Mariah Carey shared this rather timeless photo of her and Stevie Wonder.
4. Diplo looked adorable in his high school senior portrait.
5. Speaking of adorable, this photo of Silicon Valley's Kumail Nanjiani is too cute.
Hey ladies. Got any candy? #TBT
6. This photo of Kim and Kourtney Kardashian with a dead in the eyes Big Bird is rather terrifying.
7. Meanwhile, Khloé Kardashian posted a much, much less terrifying family photo.
8. Gabourey Sidibe and Pluto hanging out at Epcot back in the day.
I was raised in these streets! #thuglife #tbt
9. Awww, Sarah Michelle Gellar and her mom both making the exact same face.
#TBT Still feeling Mother's Day nostalgia
10. Neon Trees' Tyler Glenn looked stylish in stripes.
11. January Jones' magnificent mullet really was all business in the front and party in the back.
12. Veep's Reid Scott once hung out with an orangutan, because like who doesn't, right?
#TBT Caption this photo for me.
13. Emile Hirsch had blonde ambitions while filming Lords of Dogtown.
Tbt #lordsofdogtown with my brother @victorrasuk congrats on #Godzillmovie opening 2 morrow bud!
14. Robbie Williams reminded us that nobody in Take That ever wore shirts.
Friends then. Friends now @takethat #tbt
15. While CeeLo Green reminded the Force was truly with Gnarls Barkley.
Rockin' the stage #GnarlsBarkley days #TBT
16. Missed opportunity, Broad City's Abbi Jacobson is only missing the hat and glasses to what would've been a bomb Where's Waldo? costume.
#tbt from when @abbijacobson was a wiiiiiddle Where's Waldo #broadcity
17. Sir Ian McKellen took us waaaaay back to 1957, when he played a rather striking Henry V.
#TBT 1957. As Henry V outside the Great Hall of Bolton School where we did the play. #throwbackthursday