He can't stop and he won't stop! Justin Bieber loves the ladies and the ladies love Justin ... so Friday afternoon he appeared to have moved on from Baskin Champion, after he'd moved on from Selena Gomez and now he was on to a new brunette who was lucky enough to get to give the singer a head massage during a yacht charter in Newport Beach.

Yep, this mystery lady had Bieber's attention as she worked her fingers through his hair, touching pressure points on his scalp and temple and relieving the bad boy's stress. In fact, Bieber didn't actually look too stressed as he, decked out in brightly-colored sweats and a Panama hat, and his crew jumped on the Shambala charter yacht at the harbor in Newport Beach for a sunset cruise.

So who IS this mystery lady? We've got our spies working on it ... stay tuned!