Robbie Williams is to strip at Sir Elton John's 60th birthday party.The flamboyant singer is celebrating reaching the landmark age on March 25 with a special performance at New York's Madison Square Garden. It will be the 60th time he has played at the world famous venue.Elton is said to have asked his friend Robbie, 32, to perform on the night and make the day extra-special, and the 'Angles' singer has obliged by offering to do a striptease while performing classic Tom Jones hit 'You Can Leave Your Hat On'.The song is synonymous with stripping after it was used to soundtrack a male stripping scene in hit British comedy film 'The Full Monty', which starred Robert Carlyle.A source told Britain's Daily Star newspaper: "Robbie knows this is one gift Elton won't be able to out do."The pair love to shock each other, so Elton will probably already be cooking up something for Robbie's birthday next month."Robbie and openly gay Elton - whose partner is film producer David Furnish - previously fell out after Robbie, in his autobiography 'Feel', described the pop legend as "weird", and claimed he "kidnapped" him when he was suffering from alcoholism, forcing him to go to rehab.

However, the two have now patched up their differences and are "best pals again".

The special birthday concert is to be broadcast as a 90-minute TV special on British network ITV.

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