Kim Kardashian [1] hasn't been posting much on social media since the arrival of her newborn son, Saint West [2], but on Thursday, she took the time to share a special Throwback Thursday post in honor of the holiday season. Kim tweeted a video montage featuring some adorable vintage Kardashian Christmas cards, including one that shows a young Rob Kardashian, Khloé Kardashian, Kourtney Kardashian, Kris Jenner, the Jenner clan, and a giant Ninja Turtle dressed as Santa. Watch the video above to see the cute snaps, and then take a look at Kylie Jenner's latest throwback picture [3]!