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Hayden Panettiere lets those 'Nashville' pipes loose

Let the "Is she or isn't she really singing?" questioning end. At the 2013 Billboard Music Awards, Hayden Panettiere left little doubt whether she's really crooning on ABC's "Nashville," thanks to the melodic introduction she gave Macklemore and Ryan Lewis. She took her cue from their hit "Thrift Shop" -- complete with a broadcast-friendly "mmm-mmm"-- in tossing to them by singing, "This is mmm-mmm awesome." Must have been good luck: The duo won best rap song for the tune shortly after. -- Jay Bobbin, Zap2it ABC