Madonna gags Justin Timberlake

Pop superstar Madonna has banned "Sexy Back" singer Justin Timberlake from disclosing details of their recent collaboration.

Madonna and Timberlake recorded their top secret duet in London earlier this year, and Justin Timberlake has since been ordered not to talk about it, as the track in question has not yet been released.

Timberlake said: "I don't want to tell you the name of the song because she'll either kill me or have me kill you".

Meanwhile, Justin Timberlake is leading the nominations for the MTV Video Music Awards.

He has been nominated for:

Video of the Year, with "What Goes Around ... "

Male Artist of the Year.

Best Choreography, with "My Love"

Best Editing, with "What Goes Around..."

Best Director with "What Goes Around...Comes Around"