Robbie Williams is set to strip at Elton John�s 60th birthday extravaganza.

The flamboyant singer is reaching a landmark age on 25th March and will be putting on a musical showcase at New York�s Madison Square Garden.

Elton has asked his pal Robbie Williams to perform at the event and make the show� extra special�. The �Rudebox� singer has offered to strip whilst performing Tom Jones and The Full Monty hit, �You Can Leave Your Hat On�.

A source told the Daily Star newspaper, �Robbie knows that this is one gift that Elton won�t be able to out-do. The pair love to shock eachother, so Elton will probably be cooking something up for Robbie�s birthday next month�.