Threatened with a lawsuit by Bieber's lawyers, the website, Breatheheavy, took down their GIF and apologized.
If that's not enough reassurance, TMZ quotes Bieber's personal trainer:
I can definitely confirm that he is a well-endowed guy. I sound weird saying that, but yes.
Okay, good, thank god.
Justin Bieber's got it going on, and I for one can sleep peacefully tonight (unless Justin climbs through my window, in which case OUCH)