He broke his foot not his leg.
because Taylor swift said break a leg Yeah, because Taylor put a curse on Justin and made him break his foot. ;-)
Justin Bieber actually broke his foot. It happened on stage during his performance of "One Time". There is a video on YouTube of him singing, then walking off the stage limping.
Justin broke his leg while preforming his hit single "One Time" in concert in London. Hope this helped!
Taylor Swift,she was joking around because he was going out 2 perform so its basically a way of saying good luck :)