She topples Flo Rida from top spot while Bruno Mars gets No 1 album...Jessie J has knocked Flo Rida off the top of the Official UK Singles Chart, with her Domino taking this week's No 1.
Flo Rida's Good Feeling fell just one place into second, while Rizzle Kicks' Mama Do The Hump climbed two places to No 3.
Avicii's dance anthem Levels stayed still in fourth and Lloyd's Dedication To My Ex (Miss That) rounded out the top five.
Over in the Official UK Albums Chart Bruno Mars' Doo Wops and Hooligans returned to the top spot, having spent a whopping 53 weeks on the chart in total.
Adele's 21 fell one place to No 2 and Ed Sheeran's + stayed still at No 3.
The Maccabees' Given To The Wild was a new entry in fourth while new mum Beyoncé's 4 crept up one place to No 5.