Will.i.am and Britney Spears have hit No.1 in the UK singles chart.

The duo's track 'Scream & Shout' has proved a hit across the world and today (January 13) it has enjoyed more success in Britain by topping the chart.

In at No.2 this week is Taylor Swift's 'I Knew You Were Trouble', whilst James Arthur's 'Impossible' drops to No.3.

Completing the top five is Rihanna's 'Stay' and Calvin Harris' 'Drinking From The Bottle' in at No.4 and No.5 respectively.

Elsewhere in the singles chart, David Bowie's surprise comeback single 'Where Are We Now?' enters the chart at No.6 as a new entry.

Psy's YouTube monster 'Gangnam Style' meanwhile stays in the top ten at No.9.