Should she really leave Justin Bieber responsible for her grandchild?

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On Saturday, Kris Jenner gave Bieber the 'best baby in the world' title.

The 59-year-old momager snapped a pic of her two-year-old grandson, Mason Disick and Bieber having fun in the pool.

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Bieber appeared carrying him on his back with his tongue sticking out at Disick seemed to be patting Bieber playfully on the back.

"Best babysitter in the world!" Jenner wrote. "#Mason and @justinbieber family pool day!" she added with a heart emoji.

Bieber has shared a photo of Mason in the past where he wrote, "Mason is coll as a fan." He is the oldest child of Kourtney Kardashian and Scott Disick. They also have two-month-old son Reign.

The question on fans minds though is whether Bieber is really someone you should leave your kid alone with since he still acts like one himself. Also on the line are Kris Jenner's parenting skills.

She has been shamed in the past for allowing all five of her daughters to wear inappropriate clothing and she has been accused of over-exposing her family over ten year with their E! reality TV show Keeping Up With The Kardashians.

She has defended herself by saying that her daughters just don't take her discipline.

"[Most of] my girls are in their 30s, 20s, I mean, they're not going to take my discipline. I'm sure you've all seen the show, where I have no voice," she said.

Tags: Justin Bieber kris jenner