Antonia Mary Prebble is a New Zealand actress, best known for her role as Loretta West in the hit NZ comedy-drama Outrageous Fortune, as Trudy in The Tribe, as Jane in The Blue Rose, and as Rita West, the grandmother of her character in Outrageous Fortune, on the prequel series Westside. Internationally she's best known for her role as Clare Langtree, the Gatekeeper in the 2006 series Power Rangers Mystic Force.

Outrageous Fortune is a New Zealand family comedy crime drama television series, which ran from 12 July 2005 to 9 November 2010 on TV3. The series followed the lives of the career criminal West family after the matriarch, Cheryl, decided the family should go straight and abide by the law. The show was created by James Griffin and Rachel Lang and produced by South Pacific Pictures.