Photograph: Don Arnold/WireImage

At just 16 years old, Casey Donovan found herself propelled to overnight fame when she won the second season of Australian Idol.

That was 2004 and in the 17 years since, Donovan has enjoyed a career across song, stage and screen. This month she returns to Australian TV to host What Does Australia Really Think About … a new SBS program premiering 18 August at 8.30pm. Donovan’s episode of the docu-series, which explores how stigma and prejudice affect the lives of Australians, focuses on obesity. It’s a topic of personal importance to the performer, who has had to contend with comments about her weight ever since she appeared on Idol.