Its sales falling just 2.70% week-on-week as its radio and TV exposure reach new peaks, We Found Love rebounds 2-1 on sales of 79,834 copies to secure its fourth week at the summit.
It's the 37th single in 58 years of chart history to return to number one during the same chart run. Its overall sales of 534,191 copies place it seventh in the Rihanna canon, and lift her overall singles sales since 2005 debut Pon De Replay to a staggering 11,594,209.
The aforementioned Take A Chance On Me - JLS' eighth single - debuts at number two on sales of 67,850 copies. Earthquake remains at number three for Labrinth (feat Tinie Tempah) although its sales are off 21.50% week-on-week at 59,571. Meanwhile, after two weeks at number one, Read All About It dips to number four (51,473 sales) for Professor Green feat. Emeli Sande.
Pixie Lott secured her third number one single when All About Tonight - the first offcut from her second album Young Foolish Happy - debuted in pole position nine weeks ago. With the album set to drop today (14th), follow-up What Do You Take Me For (feat. Pusha T) debuts at number 10 (34,335 sales).
Featured in the new Twilight Saga movie but not on his Doo-Wops & Hooligans album, It Will Rain becomes Bruno Mars' ninth Top 20 single, debuting at number 16 (23,156 sales).
Elsewhere in the Top 40, there are debuts for Loick Essien's Me Without You (number 14, 23,962 sales); Maverick Sabre's I Need (number 18, 21,239 sales); Off The Record, by Tinchy Styrder/Calvin Harris (number 24, 14,161 sales); and No Beef, by Afrojack feat. Steve Aoki (number 25, 14,084 sales).
Florence + The Machine's Ceremonials loses its album chart crown but second single Shake It Out makes a double digit leap for the second time in a row. The track, which initially debuted and peaked at number 27 last month, has advanced 57-26-12 in the last fortnight, with increasing radio support and a sterling performance of the track on The X Factor Results Show eight days ago helping it to sales of 27,581 last week.
On its 11th appearance in the chart, Without You reaches a new peak for David Guetta feat. Usher. The track, which reached number 10 three weeks ago, and returned to that position last week, now climbs to number seven (41,078 sales).
Overall singles sales are up 0.13% week-on-week at 3,133,149 - 11.55% above same week 2010 sales of 2,808,756.