Scrolling through Kim Kardashian’s Instagram, it’s hard not to notice that the reality star hardly ever smiles in her photos. It really doesn't matter where she is or who's posing next to her, Kardashian rarely breaks her serious pose. And, the 34-year-old has revealed why.

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On Monday, North West’s mommy shared a dual Instagram photo with family friend Shamari Maurice and she’s actually smiling hard twice.

“See I do smile... even laugh on occasion,” Kardashian wrote in the caption. “Not too often though because it causes wrinkles.”

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

Una foto publicada por Kim Kardashian West (@kimkardashian) el Dic 12, 2014 at 1:31 PST

So, for all those who ever wondered why she usually poses the way she does (see the photos below), Kardashian is simply trying to look as young as possible. 

 My MCM goes to my BFF & husband! Miss you baby! #HurryHome #GoodLuckTonight

A photo posted by Kim Kardashian West (@kimkardashian) on Dec 12, 2014 at 9:36am PST

 Sisters Bff's for life!!!

Ein von Kim Kardashian West (@kimkardashian) gepostetes Foto am Dez 12, 2014 at 12:44 PST

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A photo posted by Kim Kardashian West (@kimkardashian) on Sep 9, 2014 at 5:38pm PDT