Bosworth hopes to marry and move to Sydney

"It's certainly on the horizon, but I'm not engaged, let's put it that way," she told American fashion magazine W.

Despite rumours of British heart-throb Bloom's infidelities, the 23-year-old says their relationship is going strong.

"I do know that I'm happily in a relationship, and there's nobody else I want to be with. We're both equally supportive of one another, which I think in any relationship makes things easier and seem less daunting."

Bosworth also told reporters in Los Angeles that she had a ball filming Superman Returns in Sydney and is seriously contemplating making it her home.

"It's such a fantastic country," Bosworth, who played Lois Lane said.

"I'd love to live there."