The track spends a third week atop the tally, holding off Nicki Minaj's 'Starships' at two, while One Direction's 'One Thing' climbs from six to complete the top three.
Meanwhile, Katy Perry's 'Part of Me' lifts from 11 to eight, and One Direction's 'What Makes You Beautiful' rebounds from 19 to ten.
Further down the chart, Far*East Movement and Justin Bieber's 'Live My Life' leaps from 20 to 15, Rihanna's 'Where Have You Been' re-enters at 25, and Jack Hudak and George Krikes debut at 27 with 'Different Worlds'.
We The Kings climb from 36 to 29 with 'Say You Like Me', and Gotye's 'Somebody That I Used To Know' re-enters at 36.
The Top 10 singles in full (click where possible for our reviews):
1. (1) Carly Rae Jepsen: 'Call Me Maybe'
2. (2) Nicki Minaj: 'Starships'
3. (6) One Direction: 'One Thing'
4. (3) fun. ft. Janelle Monae: 'We Are Young'
5. (5) Ed Sheeran: 'Lego House'
6. (4) Labrinth ft. Tinie Tempah: 'Earthquake'
7. (7) Skrillex: 'Bangarang'
8. (11) Katy Perry: 'Part Of Me'
9. (8) Timomatic: 'If Looks Could Kill'
10. (19) One Direction: 'What Makes You Beautiful'
Watch Carly Rae Jepsen's 'Call Me Maybe' music video below: