Photos of the Week: Mariah Carey, Fergie, Beyonce, Lady Gaga

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Actor-TV personality Nick Cannon (L) and singer Mariah Carey attends a Halloween celebration at M2 Ultra Lounge on October 31, 2009 in New York City.

Mariah Carey had a heavenly Halloween with hubby Nick Cannon. Fergie and Mick Jagger rocked the Rock Hall's 25th anniversary party. Beyoncé killed at the MTV Europe Awards, while Lady Gaga revealed a killer new look. It all happened this week, and we've got the pics to prove it.

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News of the Week: Billboard's 10 Most Popular Stories

1. Michael Jackson Hits No. 1 On Billboard 200 With 'This Is It'

2. Orianthi Steps Out Of Michael Jackson's Shadow

3. Lady Gaga Sets Latest Billboard Chart Record

4. DeRulo Tops Hot 100, But Swift Swoops In With Record-Breaking Debut Sum

5. Pearl Jam Closes Philly Spectrum With Epic Set

6. 'This Is It' - The Inside Story Of The Michael Jackson Movie

7. Beyonce Preps Live Release, Network Special, Lady Gaga Collaboration

8. Michael Jackson Has Earned $72 Million Since Death

9. Adam Lambert Reveals Single Details And Muse Collaboration, Defends Album Cover

10. 50 Cent Talks Kelly Rowland Collaboration, 'Self Destruct' Album