London, June 11 R and B superstar Beyonce Knowles and pop legend George Michael gave fans a surprise by serenading them with an unlikely duet.

The "Irreplaceable" hit-maker wrapped the European leg of her "I Am" tour in the British capital's O2 Arena this week, reports Contactmusic.

She surprised gig-goers by teaming up with Careless Whisper singer Michael for a rendition of her smash hit If I Were A Boy.

The stunner's tour will turn towards US from June 21. (ANI)