Robbie Williams plans to shed his clothes at Elton's upcoming 60th birthday bash.
According to the Daily Star, the older singer is said to have asked his friend to perform on the night and make the day extra-special, and Robbie 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
A source said: "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."
The two entertainers 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.
Besides a New York-themed party, Elton will celebrate with a special birthday concert at Madison Square Garden, which is to be broadcast as a 90-minute TV special on