1.Mark Ruffalo remembered when he and Tom Holland rode the Tron ride together at Shanghai Disneyland early last month:
2.Seth Rogen shared this behind-the-scenes pic from the filming of Superbad in 2006:
3.The Spice Girls were in a holiday mood and shared these photos from when they did a magazine shoot in Santa robes in the late '90s:
4.Also in a holiday mood was Nicole Richie, who shared this photo of herself opening gifts with "Santa" in the early '80s:
5.And of course, the Queen of Christmas herself, Mariah Carey, shared this photo of herself holding her beloved dog, Cha Cha, during their first Christmas season together in 2010:
6.The Backstreet Boys posted this very matchy-matchy photo of themselves in the '90s:
7.John Stamos remembered when Mickey Rooney guest-starred on Full House in 1994:
8.Naomi Campbell shared this photo of herself in walking the runway for Valentino in 1991:
9.Allison Janney shared this hilarious pic, paying tribute to the American Gothic painting:
10.Chris Hemsworth took it back to this past summer, when he and Tessa Thompson were filming Men in Black International:
11.And finally, Kim Kardashian shared this photo of herself alongside her siblings Kourtney, Rob, and Khloé at an event in 2007: