The minimalist and clean cover is photographed by Sebastian Kim. (source)
Click here to view last year cover featuring Pink, here to view 2012 cover featuring Carrie Underwood, here for 2011 cover with Olivia Wilde, here for 2010 cover with Crystal Renn, Alessandra Ambrosio and Brooklyn Decker, and here for 2009 cover with Renee Zellweger.