The track, which features Calvin Harris, notches up a sixth week atop the chart, holding off competition from LMFAO's 'Sexy And I Know It', which remains at two, while Bruno Mars's 'It Will Rain' completes the top three.
Elsewhere in the top ten, Flo Rida advances from eight to five with 'Good Feeling', Jay-Z and Kanye West's 'Ni**as in Paris' leaps from 15 to eight, and Katy Perry's 'The One That Got Away' holds at nine.
Further down the chart, Rihanna's 'You Da One' jumps from 22 to 19, Gavin DeGraw's 'Not Over You' lifts 26 to 23, and Drake and Nicki Minaj's 'Make Me Proud' climbs 39 to 28.
Justin Bieber's 'Mistletoe' zooms from 60 to 44, Jessie J's 'Domino' reaches a new peak of 48 from last week's 54, and Nicki Minaj's 'Roman in Moscow' starts at 64.
The Top 10 singles in full (click where possible for our reviews):
1. (1) Rihanna ft. Calvin Harris: 'We Found Love'
2. (2) LMFAO: 'Sexy And I Know It'
3. (3) Bruno Mars: 'It Will Rain'
4. (4) Maroon 5 ft. Christina Aguilera: 'Moves Like Jagger'
5. (8) Flo Rida: 'Good Feeling'
6. (5) Adele: 'Someone Like You'
7.(6) David Guetta ft. Usher: 'Without You'
8. (15) Jay-Z & Kanye West: 'Ni**as in Paris'
9. (9) Katy Perry: 'The One That Got Away'
10. (7) Gym Class Heroes ft. Adam Levine: 'Stereo Hearts'
Watch Rihanna's 'We Found Love' video below: