19. Jennifer Nettles
The Sugarland singer has become a country fixture over the past few years with a string of hit single and No. 1 albums. She's experiencing a bit of a renaissance in 2012, both professionally (she's cultivating a much wider following as judge on the new reality singing contest "Duets") and personally (last month, she announced she was expecting her first child).—Jeff Royer
(Photo: Jason Merritt, Getty Images)
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