The 42-year-old star was spotted wearing a ring set on her finger on the red carpet this week and it appeared that she wasn't keen on hiding it.
Appearing at the Academy Of Motion Picture Arts and Sciences' Hollywood Costume luncheon, Cameron flashed her left hand featuring a diamond band as she moved her hair away from her face.
Benji and Cameron, who confirmed they were a couple four months ago, have since been photographed hand-in-hand on several occasions.
Although the pair might be headed for the altar, it doesn’t appear that they will have children.
Cameron has previously said she is happy being childless. "I like protecting people, but I was never drawn to being a mother," she told Esquire magazine. "Right now, I think, things are good for me. I've done a lot. And I don't care anymore."
Yet, Benji told Details magazine that a family is 'what every man wants, whether they admit it or not.'