The singer scores her third number one track with 'Only Girl (In The World)' following her well-received performance on last weekend's X Factor. She is predicted to repeat the chart success in the UK this week.
Rihanna knocks last week's number one from Cheryl Cole down to second place. There is no change from numbers three to seven as tracks from Bruno Mars, Katy Perry, Duck Sauce, Cee Lo Green and Mike Posner retain their respective positions.
The top ten sees one new entry from Shakespears Sister as 'Stay' returns to the chart 18 years after it topped the chart, thanks to Cher Lloyd's highly-praised performance on The X Factor.
Meanwhile, Girls Aloud star Nadine Coyle faces disappointment as her debut solo single 'Insatiable' enters at number 20.
