Lance Bass, right, and Michael Turchin pose during a red carpet event before the Miss USA 2014 pageant in Baton Rouge, La.

So… is this what famous gays do when they're in relationships and no one is looking?

Lance Bass took to Instagram this week to post a prank that he pulled on fiancé Michael Turchin -- and a very revealing prank at that. Turchin seems to be about to hop in the shower when Bass sneaks up on him while making an Instagram video.

The response? An extremely cute scream from Turchin and a full-on view of his ass.

The couple celebrated the one-year anniversary of their engagement in September when Bass popped the question again and presented Turchin with a black and gold ring.

Keep being adorable, guys!