Yesterday during Chris Brown's birthday party at a roller rink in LA, apparently Chris Brown and his security jumped Usher. Seemingly, Chris Brown was upset that Teyana Taylor showed up to the party and he was upset about that because they've been on bad terms after she dropped out of his Michael Jackson Tribute for last year's AMA's (and if you remember, the tribute was cancelled, but there's no confirmation if it was cancelled due to Teyana dropping out). Usher was seen trying to mend things between Chris Brown and Teyana Taylor, but Chris was not about it. From there, things escalated and a fight ensued. Check out the video of their heated exchange before their fight broke out.