1. Mark Ruffalo posted this Avengers cast photo in honor of the film's fifth anniversary (yes, it has been 5 years!):
The first @Avengers was released 5 years ago today. Thanks for having me, everyone! #tbt
2. Mariah Carey posted this sweet photo in honor of the sixth birthday of her twins, Moroccan and Monroe:
3. Gary Sinise shared this behind-the-scenes photo from the set of Forrest Gump:
Fall, 1993, with the platoon on the set of Forrest Gump. #ThrowBackThursday #TBT
4. Ronan Farrow posted this photo from 2010, when he still used a BlackBerry:
5. Joan Collins took us back to when she delivered iconic zingers on Dynasty:
6. Nick Zano posted a photo of himself and Tyler Hoechlin, when they were just up-and-coming actors:
#tbt loooong before either of us were made of #steel @TylerL_Hoechlin
7. In honor of Star Wars Day (aka May the Fourth), Joseph Gordon-Levitt shared a photo from the red carpet of The Force Awakens:
"You must feel the Force around you..." Happy #StarWarsDay! #TBT
8. Elizabeth Banks also shared a few snaps from the red carpet of The Force Awakens in honor of Star Wars Day:
It’s #StarWarsDay y’all. #TBT to #TheForceAwakens. Can’t wait for #TheLastJedi! #MayTheFourthBeWithYou