Inside the extravagant Kardashian-Jenner Christmas party

The annual Kardashian-Jenner Christmas Eve party was as over the top as ever this year, complete with live music, a human Elf on a Shelf, matching mother-and-daughter outfits and even an upside-down Christmas tree.

This year's party was held at the home of oldest sister Kourtney Kardashian, according to People Magazine and TMZ.

Kylie Jenner, the clan's youngest sibling, celebrated by wearing matching green gowns with her 1-year-old daughter, Stormi.

Family matriarch Kris Jenner cozied up for a close-up with her mother, MJ.

Kris Jenner's ex, Caitlyn Jenner, was there, too, posing with Santa in front of the tree.

Actress Selma Blair and her son, Arthur, also joined Kris Jenner for the festivities.

Celebrity hairstylist Jen Atkin posed with Santa:

Sofia Richie, girlfriend of Kourtney Kardashian's ex and the father of her children, Scott Disick, posted a selfie on Instagram before heading to the party.

At the celebration, she filmed Sia's performance of "Chandelier" for her Instagram stories.

And Kim Kardashian-West must have been impressed with Sia's performance, too. She wrote on her Instagram stories that her brother, Rob, "can marry Sia so she can become a Kardashian!"

Comedian Kathy Griffin also was invited and posted a hilarious video of herself rummaging through Khloe Kardashian's purse.