Robyn, Swedish pop sensation is performing backing vocals for the song.The With Every Heartbeat star vehemently denied she was writing for Spears in summer last year (08/07), but claims the singer has recorded some pieces she had already written, including, Piece Of Me.She said, "It is not true that I will be writing for Britney. She has recorded some of my songs but they won't be released."
Britney Spears, troubled singer, has been given a helping hand in her new single Tagged in Robyn