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:
You could say our ability to match was… unmatched. 😂 #TBT
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:
American Gothic. #fbf #AliceSHall