Gallery STARTRAKSFormer child star Dakota Fanning,18, and Mary-Kate & Ashley's little sister Elizabeth Olsen, 23, went two pieces on the set of their new movie "Very Good Girls" in New York over the weekend.
In the flick, the bikini-clad actresses play friends who make a pact to lose their virginity during the summer after graduating high school.
They grow up so fast.
See also
Eva Longoria -- Paddle The Bikini
Kate Upton -- What's In D Cup?
Jessica Alba -- Belly Nice Bikini
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