Those Biebettes are fierce!

While performing "Baby" during a show in Pittsburgh last week, Justin Bieber worked up quite a sweat, which he naturally wiped off with a towel. No big deal until he threw it into the crowd and all hell broke loose! Hey, if there's a chance to own an authentic piece of Justin Bieber for keeps, you better bet there's gonna be a tween smack down!

Unfortunately the girls got in such a heated fight over JB's sweat, the My World singer had to stop the concert to tell them to chill out. Bieber warned from the stage:

    “You can’t fight over it. Someone’s gonna get hurt.”


Awww, how mature! Plus he's probably the only 16-year old boy who can say he had girls fighting over his sweaty towel! P-I-M-P!

Check out the video to see how Bieber handled the insanity!