At the age of 14 Grenville won the opening round of the South African 1990 Elite 'Look of the Year' contest.
She modeled briefly in Milan, before moving to New York and signing with the Next agency.
She was one of the first models of Gucci by Tom Ford (notably starring in the campaign for his famed autumn/winter 1996/97 collection)[3] and also did campaigns for Versace, Christian Dior, Valentino and Armani Exchange.
Grenville graced the covers of Vogue, Harper's Bazaar, Elle, L'Officiel, Cosmopolitan and Allure.
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