Cynthia Nixon (search) flew back to New York on Monday to celebrate her Emmy with the one person she really wanted to be with Sunday night - her new girlfriend.

"You would not be outing her [by writing about this]. Cynthia is in a relationship with a woman," said someone in the know.

The redheaded "Sex and the City (search)" star "has nothing to hide. She is simply living her life."

And it's a good life, at that.

"Winning the Emmy was huge for her," said another source. "She was elated. She is being inundated with offers right now."

Nixon will appear in "Little Manhattan" slated to debut next year, and TV execs are looking to line up the sexy star in several pilots.

The Barnard graduate and theater veteran has two children with her junior high school sweetheart, photographer Danny Mozes (search).

Nixon, who split with Mozes after six years together in June 2003, lives alone with her two children in Manhattan.

Nixon, who has known "Sex and the City" castmate Sarah Jessica Parker since their childhood days on Broadway, made an international name for herself when she was cast opposite Parker in the hit HBO show as Miranda Hobbes, a cynical corporate lawyer.

The Emmy Nixon won on Sunday was her first major solo award, although she has been nominated for a Golden Globe three times and won a Screen Actors Guild award for Outstanding Performance by an Ensemble in a Comedy Series.

Nixon, dressed in an elegant brown sheath and coral necklace, was elated and thanked her friends and castmates in her speech.

After winning the award, she celebrated for the rest of the night with castmates Parker and Kristin Davis, along with the producers, writers and directors of the show at HBO's after-party at Morton's on the corner of Melrose and San Vicente in Los Angeles.

The "Sex" women, who have become good friends, huddled in a corner gabbing for the majority of the night, and when asked by reporters about her win, Nixon would only compliment Parker.

"That's just the kind of person she is," said a pal.

Nixon's rep didn't return calls.