Other winners were Katy Perry, who received the best live act accolade, Eminem, who won best hip-hop and Linkin Park, who beat Coldplay to take home best rock.
Musicmetric's findings said that singer Ed Sheeran was the most pirated act in the UK for the first half of 2012, followed by hip-hop duo Rizzle Kicks and Barbadian megastar Rihanna.