X Factor winner Alexandra Burke has stormed to the top of the charts with her new single Bad Boys.
The tune, which features American rapper Flo Rida, has beaten Robbie Williams to the number one spot. His single Bodies went in at number two.
It's Alexandra's second chart topper. Her last hit Hallelujah became the best-selling single of 2008.
She said: "I'm blown away by the success of the single... I'm one very happy girl today."
Both Robbie and Alexandra kicked off their campaigns to get to number one by appearing on the X Factor. But it was Alexandra's tune which turned out to be more successful with fans.
Last week's number one single, Oopsy Daisy by Chipmunk, slipped to number three.
In the album chart indie band Editors went straight in at number one with In This Light and On This Evening, while Chipmunk's went in at number two with I Am Chipmunk.