Britney Spears has claimed her fourth US number one with single 'Hold It Against Me'.

The singer topped the US charts after selling over 411,000 downloads since the singles release last week, the highest ever for a feamle artist.

Spears' single was produced by her long-time studio partners Max Martin and Dr Luke. It is the first song fans have heard from her as-yet-untitled new album, due out in March.

Bruno Mars' 'Grenade' was a number two, followed by Katy Perry's 'Firework' at number three in the Billboard chart.

Meanwhile, The Bellamy Brothers have accused Britney Spears of ripping off the title of one of their biggest hits.

(by Holly Frith)