1. Chris Pratt shared this photo of himself in the early '80s, where he thought he looked like Chucky from Child's Play:
2. Gillian Anderson posted this photo of herself hanging out with Ellen DeGeneres, Brooke Shields, and Candice Bergen in 1994:
A 1994 photobomb. #tbt @TheEllenShow @BrookeShields
3. Ryan Reynolds shared this photo of himself and his brother as kids in the late '70s:
4. Danny Trejo posted this pic of himself from when he played Marcia Brady in a Snickers commercial back in 2015:
#TBT 2015 Super Bowl with @SNICKERS! #EatASnickers
5. Naomi Campbell shared this modeling shot of herself in the '90s:
6. Eva Mendes posted this cute photo of herself dressed up as Mickey Mouse back in the '80s:
7. Ashley Judd shared this beautiful photo of herself from the mid-'80s:
#tbt. College, maybe High school....
8. Shane West posted this photo of himself as a kid in the '80s, when he, apparently, was a big John Mellencamp fan:
9. Anderson Cooper shared this photo of himself from his non-silver fox days in the early '90s:
10. Charisma Carpenter posted this photo from when her character, Cordeila, dressed up like a cat on the Halloween episode of Buffy in 1997.
A Halloween themed #tbt Big cats for the win. #meow #CordeliaChase #Btvs
11. Rashida Jones shared this photo of her and Rob Lowe on the set of Parks and Rec:
12. Reese Witherspoon remembered her Oscar-winning role as June Carter Cash in 2005's Walk the Line:
13. And finally, in honor of the 20th anniversary of Halloweentown, Kimberly J. Brown (aka Marnie Piper) shared this behind-the-scenes photo of herself and the late Debbie Reynolds on the set of the film:
#tbt in honor of #halloweentown ‘s 20th anniversary! This pic was taken after our last day of shooting-most of which was spent in front of this blue screen pretending to fly on a broom with Debbie. Such a special day w/ a one-of-a-kind lady that I’ll never forget ❤️ https://t.co/0ADPD0t5gb