Kim Kardashian explains why she rarely smiles

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Kim Kardashian Explains Why She Doesn't Smile Anymore
Kim Kardashian Explains Why She Doesn't Smile Anymore


Why so serious, Kim Kardashian?

The 34-year-old reality star is rarely seen showing off her pearly whites and Kim has a simple reason why she's often never smiling or laughing: wrinkles. Yup, wrinkles.

WATCH: Kim Kardashian in 1994 Home Video: 'When I'm Famous, Remember Me as This Beautiful Little Girl'

Kim made the revelation in a tweet Monday along with a candid black-and-white photo from her family's Christmas party of her and friend Shamari Maurice laughing it up and enjoying each other's company.

See I do smile... even laugh on occasion. Not too often though because it causes wrinkles @shammaurice

Een foto die is geplaatst door Kim Kardashian West (@kimkardashian) op Dec 12, 2014 at 1:31 PST

While Kim -- ET's No. 1 headline-making celebrity of the year -- was all smiles for the holidays, the same can't be said for her adorable 1-year-old daughterNorth West when she met Santa for the first time.

NEWS: Kim Kardashian Explains Why She Cropped North West Out of Photo

"North West is still warming up to Santa," Kim wrote in the caption on the Instagram pic showing North not too thrilled about Santa's presence.

The past 12 months have been busy for Kim, from her wedding to Kanye West to landing on the cover of Vogue to "breaking the Internet" with herPaper Magazine cover. Find out why 2014 may have been her biggest year so far!

Why 2014 Was the 'Kraziest' Year Yet to Keep Up With Kim Kardashian
Why 2014 Was the 'Kraziest' Year Yet to Keep Up With Kim Kardashian


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