British newcomer Jessie J has held off competition from Bruno Mars to score her first number one on the U.K. singles chart.
The London-born singer shot to the number one slot with Price Tag, her collaboration with U.S. rapper B.o.B., forcing Mars to stay at two with Grenade.
Ke$ha's We R Who We R comes in at three, while the top five is rounded out by Adele's Rolling in the Deep and Enrique Iglesias' track Tonight.
Adele managed to hold her own in the albums countdown - her latest offering, 21, held steady in pole position while her debut, 19, is a non-mover at number four.
Dance duo Chase & Status' No More Idols enter at number two, while Mars' Doo-Wops & Hooligans is third and Rihanna's Loud rounds out the top five.