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Rex Features
The Sex And The City actress, who usually keeps her private life close to her chest, described the four-year relationship as "fantastic".
She is quoted as saying: "We shop and cook and raise children... We both pitch in. I'm in love with her because she's her. If she were a man, would I be in love with her? I don't know."
Nixon began dating the education activist in 2003 after ending her 15-year relationship with Danny Mozes, the father of her two children.
She and Marinoni now raise Samantha, 11, and six-year-old Charles together in Brooklyn.
Talking about their initial reaction to her female lover, she said: "They were fine. My son was very little [when it happened], but my daughter has a gay uncle [and her godmothers] are lesbians."
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