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Last Updated: Monday September 13 2010 18:34 GMT

Alexandra tops singles chart

Alexandra Burke performs at the Help for Heroes concert

Alexandra Burke is celebrating her third number one single after her new track Start Without You crashed straight into the charts at number one.

The song features American rapper Laza Morgan.

The single knocked Olly Murs off the top spot. His track, Please Don't Let Me Go dropped into fourth place.

Meanwhile Mercury Prize success helped boost album sales for The xx, but in the end it was Brandon Flowers' Flamingo that took the top slot.

Alexandra's success meant that for the second week in a row, Katy Perry was stuck in second place.