He hangs out at their house even when Miley's not home; he goes to church with them. This guy is the most clean-cut suitor a 15-year-old Disney moppet could want.

But in these photos, taken at a private party in the Hollywood Hills a few months after Gaston met Miley, according to Bauer-Griffin, Justin seems to show a whole other side to him!

Here Justin is engaging in typical 20-something behavior: Running around in his underwear with other topless buds, knocking back drinks, sprawling on the floor with a chick who isn't Miley, getting tossed around in his gym shorts by a burly friend (?!?).

On one hand, it's good to know that Justin Gaston is not as squeaky-clean as advertised. On the other—Billy Ray Cyrus might change his mind about who goes to church with the fam.

Then again, it's not like Miley doesn't have some interesting photos of her own out there...