Nina Dobrev, Maria Menounos, Derek Hough, Julianne Hough and Mark Ballas just put on the ultimate dance challenge.

And while sitting in front of a Christmas tree clad in a Santa hat, the Dancing With the Stars hoofer petted his dog and told the story of how their dance war started.

"At Thanksgiving time, the Menounos and the Hough family started something called dance wars and the Ballas family joined in, the Riley family joined in and we want you guys to all join in as well," Derek said in the Instavideo. "It's all about sharing something with your family and friends. Enjoy!"

Then, the dance war began.

In one video, Julianne steps out into the snow and busts out a choreographed dance routine in a Santa hat as some of her loved ones hit some moves on the side.

And in another, Derek jumps off a car and dances in the street, while Julianne pops in, hits a spin and dances some more.

Menounos put a sexy spin on her Christmas dance war video, sauntering out into a living room in a white satin dress, and knee-high boots, with a group of similarly dressed ladies.

First her group swayed their hips and popped their pelvises to "Jingle Bell Rock," and then they switched it up, showing off their moves to Mariah Carey's "All I Want for Christmas Is You."

Meanwhile, Ballas also got in on the fun, posting a few awesome videos of his family cutting a rug as well.

Although Nina Dobrev didn't post any dance war videos on her own Instagram page, she appeared in one of Julianne's videos, in which Derek was reading from a Hunger Games book to Julianne and some of his other loved ones.

"'Twas the night before Christmas and all through the house…tomorrow is dance wars and we're gonna fight, fight, fight!, Derek said. 

Nina Dobrev soon popped up behind him rocking a Santa mask, tore it off and chased everyone as they ran away screaming.

What do you think about the group's dance wars tradition? Did you join in?

Tell us in the comments!

PHOTOS: Take a peek at Nina Dobrev's best looks

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