Mary-Kate Olsen - 2009 MET Costume Gala

Mary-Kate Olsen arrives at “The Model as Muse: Embodying Fashion” Costume Institute Gala at The Metropolitan Museum of Art on Monday (May 4) in New York City.

The 22-year-old Daytime Emmy Award-nominated American actress is wearing a dress by Christian Lacroix.

Earlier, Mary-Kate was spotted having lunch with boyfriend Nate Lowman at Café Cluny. The cute couple were sipping wine, chatting, laughing, and taking pictures together.

Justin Timberlake, Kate Moss, Marc Jacobs and Anna Wintour will host the annual gala to raise money for the organization.