Katharine Towne is an American actress. She was born on July 17, 1978 in Hollywood, Los Angeles, California, USA. She was the daughter of famed screenwriter Robert Towne and Julie Payne, and granddaughter of actors John Payne and Anne Shirley. She began her career with a small role in the 1998 movie Girl. She was a guest starring as Sunday on Buffy The Vampire Slayer. She also appeared in several films such as Go, She’s All That, But I’m a Cheerleader and the Bachelor. She starred as Riley on NBC’s short-lived sitcom M.Y.O.B.. Katharine Towne played Mason on HBO’s Tell Me You Love Me.