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Nick Jonas may be popping in tonight to play a former theater kid-turned-sitcom star, but it's Katharine McPhee's Karen who grows up - and grows a spine - when rehearsals for Marilyn: The Musical finally get under way. "We'll see her step into her own," says the triple-threat stunner, whose character gets a much-needed lesson in working what she's got, courtesy of some helpful fellow chorus members and a kick-ass Adele tune. Read More > Other Links From TVGuide.com American IdolSteven SpielbergKatharine McPheeNick JonasAdeleSmash