That appears to be Kris' way of thinking as she headed to
image-sharing website Instagram on Saturday afternoon to show off a
picture of Bieber and Kourtney Kardashian's
five-year-old son Mason Disick having fun in the pool.
"#Mason & @JustinBieber family pool day!!!
#Bestbabysitterintheworld (sic)," Kris captioned the image.
Bieber himself didn't seem to hate his afternoon with Kourtney's
oldest son either. Wearing a baseball cap and his signature shades,
the crooner wrote: "Mason is cool as a fan."
The Kardashian family and Bieber have a long history and
friendship together. For a time, Kourtney was neighbours with the
There's also a special bond that Kendall Jenner and Kylie Jenner
share with the singer. Whether posing in photoshoots together or
hanging out together at mutual friends' parties, the threesome have
remained friendly for many years.