Music
Rex Features
The American singer holds off competition from Black Eyed Peas, who remain at two with 'Meet Me Halfway', while Jay Sean and Lil Wayne climb to three with 'Down'.
30H!3 and Katy Perry's collaboration 'Starstrukk' moves up to five, while David Gutta and Akon's 'Sexy Bitch' moves back up to six.
Elsewhere, Robbie Williams's comeback record Reality Killed The Video Star debuts at number one on the albums chart.
The Top 10 singles in full (click where possible for our reviews):
1. (1) Ke$ha: 'Tik Tok'
2. (2) Black Eyed Peas: 'Meet Me Halfway'
3. (6) Jay Sean feat Lil Wayne: 'Down'
4. (4) Vanessa Amorosi: 'This Is Who I Am'
5. (8) 30H!3 Feat Katy Perry: 'Starstrukk'
6. (5) David Guetta ft. Akon: 'Sexy Bitch'
7. (3) Lady GaGa: 'Bad Romance'
8. (7) Britney Spears: '3'
9. (7) La Roux: 'Bulletproof'
10. (9) Miley Cyrus: 'Party In The USA'
Singles Reviews
Darren Hayes: 'Bloodstained Heart' review Hayes continues his pursuit for old-fashioned romanticism.
The Sound
Sunday chart predictions: Maverick Sabre, moreHas Maverick Sabre topped the album charts? Find out in Friday's midweeks.
Music Interviews
Adam Lambert eyes Jessie J collaborationDigital Spy talks to the singer about his new album 'Trespassing'.
Album Reviews
Speech Debelle: 'Freedom of Speech'Speech Debelle storms back with her second album Freedom of Speech.
