Ajay Rochester (born 17 April 1969 in Sydney) is an Australian actress, author and producer. She was the host of the Australian version of reality weight-loss television series The Biggest Loser, for which she hosted a total of four series between 2006 and 2009.
Rochester was adopted as a child, and states she was emotionally and physically abused by her adoptive mother. She located her birth mother in 1992 after years of searching. Her birth mother suicided a year later. Rochester has a son Kai, who was diagnosed with Asperger syndrome at the age of five. Rochester suffered from obesity, which she attributed to the death of her birth mother and her estrangement from her adoptive mother. She resolved to lose weight following the birth of her child, and shed over 50 kilograms since giving birth.
Recording her weight loss after her son's birth, she filmed the documentary Larger Than Life which aired on The Lifestyle channel. It followed Rochester for a year as she lost weight and took back her life.