Chris Brown, left, and Drake. (Matt Sayles, Chris Pizzello/AP)

• A bottle-throwing bar brawl involving the entourages of hip-hop heartthrobs Chris Brown and Drake is being investigated by New York City police. Authorities told the AP that five people were injured at SoHo nightclub W.i.P., including one man with a serious cut to the head — but that both stars were gone by the time cops arrived at 4 a.m. Thursday. As with most celebrity beefs these days, much of the action played out on Twitter: Brown, 23, tweeted, then later deleted, a photo of his bloodied jaw and a few random taunts (“throwing bottles like girls?”). A rep for Drake, 25, said the singer was on the way out of the bar at the time and didn’t do anything to cause injuries or damage. History here? Both dated Rihanna — though Brown, as you know, is the one on probation for beating her up in 2009, if you feel like you need to pick sides here.