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In the words of Heath Ledger as The Joker in The Dark Knight, "Why so serious?" -- a question Kim Kardashian is giving us the answer to. As you may have noticed, the reality star doesn't smile too much in photos, whether it's on the red carpet, on Instagram ... she very rarely flashes her pearly whites.

Mrs. West certainly has a lot to smile about, so what's with the resting Kim face all the time? She answers that question with a little post on Instagram by sharing some photos of her and pal Shamari Maurice from her family's Christmas party. And in the photos she's actually smiling!

Kim captioned the photo, "See I do smile... even laugh on occasion. Not too often though because it causes wrinkles."

See Kim's smiling face below:

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

Une photo publiée par Kim Kardashian West (@kimkardashian) le

So there you have it folks! Kim's secret to no wrinkles is not to smile too often. And she DOES smile -- sometimes. 

Photo: Getty Images