Kim Kardashian Doesn't Smile Often Because it Causes Wrinkles

Kim Kardashian is responding to some social media backlash over her tendency to never smile in photos she posts online.

The 34-year-old reality star posted a photo in which she’s seen smiling with her younger sister Kendall Jenner‘s BFF Shamari Maurice, along with a surprising reason why she doesn’t often smile.

PHOTOS: Check out the latest pics of Kim Kardashian

“See I do smile… even laugh on occasion. Not too often though because it causes wrinkles,” Kim tweeted.

DO YOU SMILE in photos posted to social media? Bigger picture inside…