'Price Tag' jumps 11 places, knocking Bruno Mars into second place. Rihanna also enjoys a jump from number 14 into the top three - her third consecutive top three hit from Loud.
Meanwhile, Chris Brown returns to the top with 'Yeah 3x'. The track climbs an impressive 15 spots to number nine this week. The singer also features on Chipmunk's 'Champion' which debuts at number 14.
Improving on last week's positions are Tinie Tempah and Ellie Goulding, whose collaboration 'Wonderman' climbs to number 21, Avril Lavine at 30 with 'What The Hell', Alexis Jordan's 'Happiness' now at number 32 and Dr Dre's 'I Need A Doctor' which features Eminem and Skylar Grey which climbs into the top 40 at number 39.
This week's top 10 in full:
1. (12) Jessie J ft. B.O.B : 'Price Tag'
2. (1) Bruno Mars: 'Grenade'
3. (14) Rihanna: 'S&M'
4. (3) Jamie Lawson: 'Wasn't Expecting That'
5. (2) Adele: 'Rolling In The Deep'
6. (6) Martin Solveig & Dragonette: 'Hello'
7. (4) Diddy Dirty Money: 'Coming Home'
8. (5) Enrique ft. Ludacris: 'Tonight I'm Loving You'
9. (24) Chris Brown: 'Yeah 3x'
10. (7) Taio Cruz ft. Kylie Minogue: 'Higher'