Music
Rex Features
The American singer holds off competition from Metro Station and The Pussycat Dolls, who claim second and third spot.
Elsewhere, Kid Rock falls to fourth with 'All Summer Long', while Lady GaGa climbs four places to fifth with 'Just Dance'.
The top ten in full:
1. (1) Katy Perry: 'I Kissed A Girl'
2. (2) Metro Station: 'Shake It'
3. (4) Pussycat Dolls: 'When I Grow Up'
4. (3) Kid Rock: 'All Summer Long'
5. (9) Lady GaGa: 'Just Dance'
6. (5) Sam Sparro: 'Black & Gold'
7. (10) Jason Mraz: 'I'm Yours'
8. (7) Miley Cyrus: 'See You Again'
9. (6) Jordin Sparks and Chris Brown: 'No Air'
10. (8) Chris Brown: 'Forever'
Singles Reviews
Stooshe feat. Travie McCoy: 'Love Me' reviewThe trio breathe life into the girl band genre on their debut single.
The Sound
Big Time Rush's Valentine's Day playlistWe ask Big Time Rush for their all-time favourite love songs.
Music Interviews
Cher Lloyd: 'LA Reid loves scrambled eggs'Digital Spy finds out what the singer has been up to in America.
Album Reviews
The Ting Tings: 'Sounds From Nowheresville' reviewThe duo overcomplicate matters on their second studio album.
