Jason Derulo has scored his third U.K. number one with a little dirty talk. The R&B star's single Talk Dirty has ended Katy Perry's two-week run at the top with Roar. Thrilled Derulo is till trying to come to terms with his success overseas, stating, "I'm gonna have to move to the U.K. in a minute!" His new song knocks Perry to two, while Jessie J's It's My Party crashes into the new countdown at three. OneRepublic's Counting Stars and Avicii's You Make Me round out the top five, while the DJ's former number one, Wake Me Up, stays put at six. Arctic Monkeys have held on to the top spot in the U.K. albums chart. The group's AM keeps new entries from Avicii (True) and Elton John (The Diving Board) off the top. Elton's number three debut is his 31st studio album.