Yes, Justin broke his foot. He fractured it while opening for Taylor Swift in London at the Wembly Arena performing his last song of the night "One Time." There are pictures posted online of him in a cast, there is a video on youtube of him talking about the incident with Taylor (link), and he has tweeted several times about it as well. In addition there is a video on youtube where you can see him rolling his foot and almost falling while running down a ramp on stage in the beginning of the song (link). He not only hurts his foot but he finishes the song. You can tell he is in pain as he is limping around the stage performing and trying to dance.
taylor swift said break a leg. as in good luck. and he really brook his foot and it is for real. and he was practing it a twisted it. then on stage he mad it worst. yess he sure did break. it . he says hi..
yes he did. in the last song ONE TIME i tripped over something on stage coming down the ramp and felt my ankle roll in a very bad way. turns out I fractured my foot and had to finish the song on a broken foot. After i was done i was in such pain i skipped the encore and got off stage and back to see the medics. link << check this out. this is what JB said on twitter. :D