Jullienne attended Corran School for Girls, and was active in drama, with lead roles in productions of Amadeus, Julius Caesar and Anything Goes, and she won several awards, including the 1999 NZ Young Performer of the Year, 1st prize in the 1999 Auckland National Independent Schools Speech Competition, and 1st prize in the Auckland Drama Championship at the North Shore Performing Arts Festival. In 2007, she won the Air New Zealand Screen Award for Performance by a Supporting Actress, for her role on Shortland Street.