Hilary Duff and her sister Haylie were on hand for the ‘Material Girls’ New York Premiere on Monday (August 14) at Chelsea West Cinemas in New York City. The sisters later celebrated with an after party at Pink Elephant. Check out pictures from Corbis, ShootingStar, FilmMagic, RexFeatures, GettyImages, and WireImage (premiere1 / premiere2 / afterparty). Additionally, video is available from CBSNews.com below the cut.