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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