United Kingdom, March 4 -- Sienna Miller thinks people "still fetishise" older women dating younger men.

The 44-year-old star - who is expecting her second child with 29-year-old partner Oli Green - has opened up on the way society views age gap relationships when the woman is the older person in the romance.

She told Grazia magazine: "I remember being 21 and auditioning to be the love interest of a 45-year-old man.

"Things have moved on since then, but the idea of an older woman with a younger man, for example, is still fetishised rather than normalised - there's a disparity there that I would love to see disappear."

Sienna was frustrated early in her career when she became more famous for her high profile romance with Alfie castmate...