Celebrity Mobile: Madonna: Intimate concert in New York

Madonna joins Justin Timberlake to celebrate the release of her album Hard Candy at a New York gig.

Madonna emerges on a throne singing "Candy Shop" during a special show for her fans at the Roseland Ballroom in New York City on April 30, 2008.

A crowd of Madonna fans — many of which had been camped out outside the venue for a chance to get a wristband allowing them access to the show — gathers outside the Roseland Ballroom in New York City on April 30, 2008.

The pair performed their single 4 Minutes at the Roseland Ballroom. Fans queued up for days outside the venue.

The album is on course to become Madonna's 10th UK number one album, outselling its closest rival by more than 50%, according to early figures.

It is also on course to knock Mariah Carey's E=MC2 off the top of the US album chart.

Justin Timberlake joins Madonna to perform their single "4 Minutes" at New York's Roseland Ballroom on April 30, 2008.

If Hard Candy does make number one in the UK, Madonna will become only the third act to achieve 10 number ones - although that calculation includes the 1996 Evita soundtrack, which featured other artists other than Madonna.

The Beatles currently head the all-time list with 15 number ones, while Elvis Presley has 11.