He's really sowing his wild oats these days!

Just days after skinny dipping with Aussie model Sahara Ray in Hawaii, Justin Bieber was spotted holding hands with model Sofia Richie in Laguna Beach. Not only that, but Nicole Richie's little sis was photographed leaving JB's Toluca Lake pad in pajamas on Tuesday. Let's hope it was simply an innocent sleep over, because she's 17 and he's 22.

Lionel Richie's baby girl is pals with the Jenner girls, so that could be how she met The Biebs.

The "Cold Water" crooner has romanced his fair share of beauties this year. From Kourtney Kardashian to Hailey Baldwin and now Sofia, he really gets around!