But a set of snaps from a recent private party in the Hollywood Hills show a different side of Justin.
Instead of being photographed going to church with the Cyrus clan or taking bike rides with Miley's little sis, these shots are a little less than wholesome...
In one, a shirtless Justin flips off the camera while cuddling an unknown blonde. In more pics, the underwear model is partying in skivvies and a baby tee.
Check out all the photos of Justin gone wild for yourself and tell us: Is this just good, clean fun—or is this older dude bad news for our precocious Miles?