The cover is shot by Robbie Fimmano. (source)
Click here to view last year cover featuring Jessica Alba, here for 2017 cover with Nicole Kidman, here to view 2016 cover featuring Jessica Alba, here to view 2015 cover featuring Zoë Saldana, here to view 2014 cover featuring Kate Hudson, here to view 2013 cover featuring Salma Hayek, here to view 2012 cover featuring Salma herself, here to view 2011 cover featuring Eva Longoria, here for 2010 cover with Cameron Diaz, and here for 2009 cover with Michelle Pfeiffer.