Winehouse steps into the spotlight during the 46664 concert honoring Nelson Mandela in London. Plus: Rihanna & Adam Levine, Blake Lively, Mary-Kate Olsen and more

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'VIVA' COLDPLAY

Coldplay singer Chris Martin really holds that note during a performance Friday on the Today show in New York. Recently, the British rockers have returned to the stage after releasing their album, Viva La Vida.