The singer's debut track continues to lead the tally, fighting off competition from X Factor Australia winner Reece Mastin, who lands at two with 'Shut Up & Kiss Me'.
Meanwhile, Ed Sheeran's 'Lego House' climbs from five to four, Maroon 5 and Wiz Khalifa debut at seven with 'Payphone', and Flo Rida starts at eight with 'Whistle'.
Gotye's 'Somebody That I Used To Know' leaps from 28 to 19, Lakyn Heperi lands at 33 with 'Kids', and Sheeran's 'The A Team' re-enters at 39.
Gavin DeGraw rebounds to 42 with 'Not Over You' and Linkin Park enter at 50 with 'Burn It Down'.
The Top 10 singles in full (click where possible for our reviews):
1. (1) Carly Rae Jepsen: 'Call Me Maybe'
2. (-) Reece Mastin: 'Shut Up & Kiss Me'
3. (2) Delta Goodrem: 'Sitting On Top Of The World'
4. (5) Ed Sheeran: 'Lego House'
5. (3) Florence + the Machine: 'Never Let Me Go'
6. (4) Nicki Minaj: 'Starships'
7. (-) Maroon 5 ft. Wiz Khalifa: 'Payphone'
8. (-) Flo Rida: 'Whistle'
9. (7) Labrinth ft. Tinie Tempah: 'Earthquake'
10. (8) fun. ft. Janelle Monae: 'We Are Young'
Watch Carly Rae Jepsen's 'Call Me Maybe' music video below: