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American actor Kristen Stewart said on Tuesday she was engaged to her partner of two years, actor and writer Dylan Meyer.

Stewart, who in 2017 said she was bisexual, said Meyer had proposed to her.

"We're marrying, we're totally gonna do it. ... I wanted to be proposed to, so I think I very distinctly carved out what I wanted and she nailed it," Stewart told SiriusXM's The Howard Stern Show.

"It was very cute. ... We're marrying, it's happening."

Stewart, 31, plays Britain's Princess Diana in the film Spencer, which arrives in movie theatres this week. She rose to global fame in the Twilight movies and dated her co-star, Robert Pattinson.

Her performance as Diana has won rave reviews, with many movie critics tipping her for a best actress Oscar nomination.

Meyer, a writer and actor, is known for her work on the Netflix movie Moxie and Miss 2059.