Cynthia Nixon hasn't changed her "sexual orientation" since falling in love with a woman.
The 'Sex And The City' actress - whose fiancee Christine Marinori gave birth to the couple's baby son Max in February - explained despite having been in relationships with men all her life, she found it natural when she fell in love with another woman.
She said: "In terms of sexual orientation, I don't really feel I've changed. I'd been with men all my life, and I'd never fallen in love with a woman. But when I did, it didn't seem so strange.
"I'm just a woman in love with another woman."
Before she embarked on her relationship with Christine, Cynthia - who shot to fame playing lawyer Miranda Hobbs in 'Sex and the City' - always spoke out in favour of women in same-sex partnerships.
She added to Australia's Daily Telegraph newspaper: "Before I ever dated a woman, I'd go to GLAAD (Gay and Lesbian Alliance Against Defamation) events and make speeches.
"I did a lot of speaking about funding for public schools, women's right to choose and breast cancer."
Cynthia - who has been dating Christine since 2003 and has two children, Samantha, 14, and Charlie, nine, with her ex-boyfriend Danny Mozes - recently admitted her ideal man is a woman.
She said: "I have to say that in terms of the particular person I'm with I guess I do feel that the ideal man is a woman. I feel that she's much more intuitive about what's going on with me. She is much more willing to treat it like a partnership."