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Kim Kardashian, Instagram

Instagram

Why so serious, Kim Kardashian? Well, that's an easy one—wrinkles, duh!

The E! star is famous for perfecting her killer smize and resting bitch face in photos, but Kim recently took to Instagram to prove that she does flash her pearly whites from time to time (and even indulges in a laugh!), she just doesn't do it too often. And there's a very simple reason behind it.

"See I do smile... even laugh on occasion. Not too often though because it causes wrinkles," North West's mama wrote with a cute picture of her showing off her beautiful smile while making use of the photo booth at her family's Christmas party alongside pal Shamari Maurice.

We can't help but assume that Kim was being a little sarcastic with that caption. After all, fans of Keeping Up With the Kardashians have seen the brunette beauty flaunt her smile and laugh plenty of times!

Unfortunately, the same can't be said for Nori—at least when it came to meeting Santa Claus this Christmas.

Kim shared an adorable photo of her daughter meeting Saint Nick during the family party, and her baby girl did not seem to be enjoying one bit of it.

"North is still warming up to Santa," Kanye West's wife captioned the funny picture. "The same Santa has come to my moms Christmas Eve party since I was a kid. I love sharing the tradition with my baby girl! Hope everyone had the best Christmas."

Santa did offer a crying North a baby doll as a peace offering, but there's no word on whether it worked. A for effort, Claus.