1. RIHANNA

Even Rihanna, the revamped, tough-as-her-gun-tattoo songstress, had to hashtag a plead to spare her life in her tweet about seeing the Bieber's "six pack," (that, at his age, means more like Juicy Juice boxes than Budweiser cans). If we're not threatened by the pair's awkward, shirtless encounter, Bieber fanatics shouldn't be either.