She was born in Sydney, Australia. She is known for a gap-tooth smile. She was discovered in Melbourne and has appeared on the cover of Australian Vogue.In 2008, she was considering a role in an Entourage-like drama alongside Alyssa Sutherland. In May 2009, Australian media reported that Hart had signed on to appear in advertising for Victoria's Secret. With Heidi Klum, Karolina Kurkova and Adriana Lima all pregnant in the fall of 2009, Hart appeared extensively in the season's Victoria's Secret catalogs.