1. Mindy Kaling took us back to her college days when she was part of the improv troupe, The Dog Day Players.
2. While Chromeo's Dave 1 and P-Thugg took us back to their high school days.
3. Speaking of high school, Lance Bass looked adorable at his homecoming dance.
4. Bryan Greenberg shared this selfie of himself hanging out with Steve Howey and Chris Pratt, while they filmed Bride Wars.
TBT 2009 with @reelstevehowey @prattprattpratt Overcompensating with muchisimo shooting #BrideWars
5. Super cute: Mia Farrow holding her doll, Mickey.
my doll Mickey and me #TBT
6. Modern Family's Sarah Hyland posted a side-by-side photo with her younger self.
7. MSNBC host, Chris Hayes, took us back to his acting days in the late '90s.
Me, in profile, as Melchior in a poster for PW production of Spring Awakening in May '98 w @jzarrow #tbt
8. Jane Lynch proudly rocked a sweatershirt for Chicago's Steppenwolf Theatre Company.
In my @steppenwolfthtr sweatshirt circa 1990
9. And finally, Melissa Rivers remembered her late mother, Joan Rivers.
