Milla Jovovich wearing a nightie that slips off her shoulder to reveal a nipple as she sits on a bed. She then drops the nightie off completely to expose her butt from behind.

Katherine Waterston - The Babysitters

Jennifer Connelly naked with a beauty pageant sash on and some gloves, showing her bare butt and left breast as she sings and dances around a bit in a factory before a guy rushes over to cover her up.

Jessica Alba - The Sleeping Dictionary

Brittany Snow - X http://www.imdb.com/name/nm0811242/

Naomi Watts reclined in a bath tub with her arms up on the edges before she startles and moves her arms down, giving us a brief peek of her right nipple slipping into view from under the water...