Dakota Fanning and Elizabeth Olsen on Set in Bikinis

Dakota Fanning and Elizabeth Olsen Sport Strapless Bikinis on Set

Dakota Fanning and Elizabeth Olsen showed off their bikini bodies.

Dakota Fanning and Elizabeth Olsen were back on the set of Very Good Girls yesterday in nude-colored strapless bikinis. Dakota and Elizabeth, who splashed around together between takes, play best friends who end up falling for the same guy in the movie. The story was written by Jake Gyllenhaal's mother, screenwriter Naomi Foner. The cast also includes Demi Moore and Richard Dreyfuss, both of whom were spotted on the NYC set last week. Yesterday, though, Dakota and Elizabeth were solo as they filmed some swimsuit-clad scenes in the ocean at a Brooklyn beach, braving the chilly water as crew members waded along with them. Let us know which celeb you think should come out on top in this year's PopSugar Bikini Bracket and you might be the lucky winner of a $500 gift card for Neiman Marcus.