An unchanged top two sees 'Grenade' secure another week on top, fighting off continued competition from Adele's 'Rolling In The Deep'. Jamie Lawson scores this week's highest new entry with 'Wasn't Expecting That' debuting at number three. Diddy Dirty Money and another new entry, this time from Enrique and Ludacris, round off the top five.
Taio Cruz and Kylie Minogue enjoy a 26-place jump into the top ten, as their track 'Higher' charts at number seven.
Jessie J's 'Price Tag' enters the chart this week at number 12, while Rihanna's 'S&M' climbs to number 14. Pink also makes her way into the top 20, with 'F**kin Perfect' jumping from number 38 to number 16.
Elsewhere, Tinie Tempah and Ellie Goulding's 'Wonderman' sits at number 25.
This week's top ten in full:
1. (1) Bruno Mars: 'Grenade'
2. (2) Adele: 'Rolling In The Deep'
3. (*) Jamie Lawson: 'Wasn't Expecting That'
4. (3) Diddy Dirty Money: 'Coming Home'
5. (*) Enrique ft. Ludacris: 'Tonight I'm Loving You'
6. (6) Martin Solveig & Dragonette: 'Hello'
7. (33) Taio Cruz ft. Kylie Minogue: 'Higher'
8. (5) Rihanna ft. Drake: 'What's My Name?'
9. (4) Matt Cardle: 'When We Collide'
10. (7) David Guetta ft. Rhianna: 'Who's That Chick'