Harry also pulled a prank on Piers Morgan, yanking his shorts down - and Piers never saw it coming. Well played, Harry. Check out how proud he is of himself afterwards.
Harry may want to wear a belt though, because Piers is looking for payback, tweeting: "Revenge will be sweet @Harry_Styles ...watch your shorts."
Piers' team had the last laugh, however, beating Niall's team in the match...but the real winner is the charity, Irish Autism Auction.