VIDEO : One Direction Star Liam Payne Injures Himself During Niall Horen's Las Vegas Birthday Celebr

The One Direction boys really know how to party hard! A little too hard for Liam Payne though. According to the Mail online the Best Song Ever singer ended up in the emergency room after getting a little too carried away breakdancing during a night out in Las Vegas while celebrating band mate Niall Horen's birthday.