Spears gives Jonas a performance to remember at London's Wembley Arena. Plus: Kim Kardashian, Beyoncé, R-Pattz and more

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She's not afraid to shine! Channeling her inner Toddlers and Tiaras beauty queen, a sparkling Fergie is ready for her close-up at Heidi Klum's 12th annual Halloween party Monday in New York.

See more spook-tacular star Halloween costumes here!