The singer notches up a ninth week at the summit, after being ousted by LMFAO's 'Sexy And I Know It' last week, which falls to two.
Meanwhile, Adele leaps from eight to four with 'Set Fire To The Rain', and Jason Mraz debuts at number eight with 'I Won't Give Up'.
Further down the chart, Snoop Dogg, Wiz Khalifa and Bruno Mars advance from 14 to 11 with 'Young, Wild & Free', Jessie J's 'Domino' jumps from 21 to 17, and Kelly Clarkson re-enters at 57 with 'Stronger (What Doesn't Kill You)'.
will.i.am, Jennifer Lopez and Mick Jagger's 'T.H.E (The Hardest Ever)' vaults 90 to 62, The Black Keys lift 79 to 69 with 'Lonely Boy', and Florence + the Machine's 'Shake It Out' shifts from 89 to 73.
The Top 10 singles in full (click where possible for our reviews):
1. (2) Rihanna ft. Calvin Harris: 'We Found Love'
2. (1) LMFAO: 'Sexy And I Know It'
3. (4) Bruno Mars: 'It Will Rain'
4. (8) Adele: 'Set Fire to the Rain'
5. (5) Flo Rida: 'Good Feeling'
6. (3) Katy Perry: 'The One That Got Away'
7. (7) Jay-Z & Kanye West: 'Ni**as in Paris'
8. (*) Jason Mraz: 'I Won't Give Up'
9. (6) LMFAO ft, Lauren Bennett & GoonRock: 'Party Rock Anthem'
10. (9) Adele: 'Someone Like You'
Watch Rihanna's 'We Found Love' music video below: