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Khloe Kardashian, Mason Disick, Christmas

Instagram

After a big, rockin' Christmas party at mom Kris Jenner's home, the rest of the holiday was child's play for Khloe Kardashian.

The 31-year-old Keeping Up With the Kardashians star spent some quality time with her nieces, North West, 2, and Penelope Disick, 3, and nephew Mason Disick, 6, as seen in photos posted on her Instagram page on Friday, Christmas Day.

Khloe shared a pic of herself and the latter, sister Kourtney Kardashian's eldest of her three children, sporting adorable holiday-themed onesies and giving the peace sign while posing in front of a Christmas tree.

"Merry Christmas Mase x KoKo," Khloe wrote.

Khloe Kardashian, North West, Christmas

Instagram

She later shared pics of North giving her a makeover...as best as a 2-year-old can.

"I'm North's first makeup client," Khloe wrote, alongside a photo of herself sporting a face full of lipstick.

Khloe Kardashian, North West, Christmas

Instagram

The little girl and her Kim Kardashian, 35, were also spotted at Kris' big Christmas Eve bash. This marked Kim's first party appearance since giving birth to North's little brother, Saint West, earlier this month.

Khloe later posted a photo of Penelope sitting on her lap, next to the Christmas tree.

Khloe Kardashian, Penelope Disick, Christmas 2015

Instagram

Khloe Kardashian, Penelope Disick, Christmas 2015

Instagram

"Merry Christmas to everyone!!!" she wrote.

Watch Keeping Up With the Kardashians on Jan. 3 at 9/8c on E!