The covers are shot by Chris Colls. (source)
Click here to view last year cover featuring Blanca Padilla, here to view 2015 cover featuring Eva Longoria, here to view 2014 cover featuring Anna Selezneva, here to view 2013 cover featuring Toni Garrn, here to view 2012 cover featuring Constance Jablonski, here for 2011 cover with Evan Rachel Wood, and here for 2010 cover with Lindsay Ellingson.