Sara Paxton is Last House Lovely

Sara Paxton steps out in a backless blue dress at the premiere of The Last House on the Left at Hollywood’s Arclight Cinemas on Tuesday night (March 10).

The 20-year-old actress stars as Mari in the horror flick. After kidnapping and brutally assaulting two young women, a gang led by a prison escapee unknowingly finds refuge at a vacation home belonging the parents of one of the victims (Paxton) — a mother (Monica Potter) and father (Tony Goldwyn) who devise an increasingly gruesome series of revenge tactics.

The Last House on the Left hits theaters THIS Friday.

20+ pics inside of Sara Paxton showing off her back…