Celebrity smile is customarily an expression denoting pleasure, happiness, or amusement, but can also be an involuntary expression of anxiety, in which case it is known as a grimace. Many biologists think the smile originated as a sign of fear. Primalogist Signe Preuschoft traces the smile back over 30 million years of evolution to a "fear grin" stemming from monkeys and apes who often used barely clenched teeth to portray to predators that they were harmless. Biologists believe the smile has evolved differently among species and especially among humans. Humans smile differently. Some show their teeth when they smile, some don't. Below Best Celebrity smiles :
Jessica Alba
Jennifer Garner
Julianne Hough
Penelope Cruz
Mandy Moore
Halle Berry
Julia Roberts
Beyonce Knowles
America Ferrera
