Rihanna who releases her new album 'Loud' this week says she is not worried about album sales.

'Loud' has sold 10,000 fewer copies than 2009's 'Rated R' in the US, the Daily Double reports.

"Never have I ever stressed out on the first week. Ever since 'Good Girl Gone Bad', the first week was like 160,000, and it grew to sell nine million albums," Rihanna said on he Angie Martinez Show.

She added: "The first week never determines what the success of the album will be."

Meanwhile, the singer has been causing controversy this week with the release of provocative promotional pictures from Loud's cover sleeve.

Rihanna will have competition in the charts as Take That's 'Progress' made UK chart history this week.

(by Holly Frith)