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Penelope disick, North West

North WestandPenelope Disick clearly come from the Kardashian family, because these baby girls are already besties!

And 4-year-oldMason Disick is loving behind the oldest cousin of the bunch, aunt Kim Kardashian revealed Tuesday in a Mobio Insider Q&A.

"its so cute how they all love each other so much!" she gushed. "Penelope & North are bff! Mason bosses them around and is super protective."

And this Christmas, Penelope, 17 months, and Nori, 6 months, will get to celebrate the holiday together—with the whole family, in fact! One fan asked Kim, 33, if she was going to "spend Christmas with all of [her] family" or "spend it with Kanye [West] and North," to which she replied, "the entire family!"

PHOTOS: Check out the best moments from the Kardashian family Christmas special

"kanye, north, mom, sisters, step dad [Bruce Jenner], brother, niece, nephew, everyone!" she explained. "they are all my family and we will all be together! i can't wait!"

"it's my absolute favorite time of the year," the Keeping Up With the Kardashians star added.

The Kardashian-Jenner clan are all about the holidays. In fact, momager Kris Jenner told E! News "the real Santa [Claus]" and his elves will be paying a visit to the family's annual Christmas party.

Merry Christmas, dolls!