Music
The American singer's second stint at the top extends to four weeks, while Jessica Mauboy rises nine places to number two with 'Burn'.
Elsewhere, ex-Neighbours actress Natalie Bassingthwaighte enters at eight with 'Alive' and Kevin Rudolf's collaboration with Lil Wayne 'Let It Rock' debuts at ten.
Kings of Leon's Only By The Night is number one the album chart.
The top ten Australian singles in full (click where possible for our reviews):
1. (1) Lady GaGa: 'Poker Face'
2. (10) Jessica Mauboy: 'Burn'
3. (2) Kings of Leon: 'Use Somebody'
4. (4) The Ian Carey Project: 'Get Shaky'
5. (5) Beyoncé: 'Single Ladies (Put A Ring On It)'
6. (3) T.I. Feat Rihanna: 'Live Your Life'
7. (6) Britney Spears: 'Circus'
8. (12) Natalie Bassingthwaighte: 'Alive'
9. (8) Kings of Leon: 'Sex On Fire'
10. (14) Kevin Rudolf feat. Lil Wayne: 'Let It Rock'
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