A poll of its membership revealed Mendes, star of "Hitch" and "We Own the Night," is the No. 1 choice for a best female smile, garnering 38 percent of the vote.

Coming it at No. 2 was "The Devil Wears Prada" and "Becoming Jane" actress Anne Hathaway, followed by "Almost Famous" and "You, Me and Dupree" leading lady Kate Hudson.

The second-best celebrity male grin belongs to soccer great David Beckham, while "I Am Legend" star Will Smith comes in third on the list.