Aviva Farber (born July 10, 1984) is an American actress known best for her roles in the hit Judd Apatow and Seth Rogen comedy, Superbad; as young Shannon Gibbs, the first wife of Special Agent Leroy Jethro Gibbs, in flashbacks on the US TV drama NCIS; and as Mandy, the much younger girlfriend of Ken Marino on Party Down.