A young woman was raped at a Manhattan house party by two men who left her lying on the bathroom floor, police said Sunday.

The 25-year-old woman and a friend allegedly met the group of men on the street Friday night and accompanied them to a house party at a high-rise on West 17th Street near 9th Avenue in Chelsea, police sources said.

The woman told police one of the men followed her into the bathroom at the party and began kissing her around 4:30 a.m. Saturday, cops said.

The man, 26, then allegedly raped the woman, police said. She was then sexually assaulted a second time by one of his friends, police said.

Her attackers left the apartment together, with their victim still lying on the bathroom floor, police said.

The woman, who reported the rape a few hours later, was treated for her injuries at an area hospital, where she was treated for her injuries.

The NYPD’s Special Victims Unit is investigating.