November 23, 2011 By Andrew Hampp, New York Following a successful 2010 campaign, Coca-Cola has holiday music plans again this year - this time with Natasha Bedingfield. The "Unwritten" singer is the new vocalist for Coca-Cola's 2011 global campaign, featuring the song "Shake Up Christmas" written and produced by Butch Walker. Originally recorded by Train for the 201...