Susan Walters (born September 28, 1963) is an American actress and former model, best known for her roles as Lorna Forbes on the ABC daytime soap opera Loving from 1983 to late 1986 and as Diane Jenkins on the CBS soap opera The Young and the Restless from 2001 to 2004, and again briefly in 2010. Walters had recurring roles as a principal on The CW's One Tree Hill and the mayor of Mystic Falls on The CW's The Vampire Diaries.