American pop singer and songwriter Lady GaGa performs at the Isle of MTV music concert in Floriana, outside Valletta, in this June 25, 2008 file photo. Los Angeles-based RedOne produced and co-wrote dance-pop singer Lady GaGa's single "Just Dance," which has ruled the charts on either side of the Atlantic for two weeks. The tune will also vie for a dance Grammy on Feb. 8. REUTERS/Darrin Zammit Lupi/Files (MALTA). MALTA OUT. NO COMMERCIAL OR EDITORIAL SALES IN MALTA.