Christine Marinoni and Cynthia Nixon Christine Marinoni and Cynthia Nixon

Sex and the City star Cynthia Nixon and fiancée Christine Marinoni have welcomed a son.

Marinoni, an education activist, gave birth to Max Ellington Nixon-Marinoni on Monday. Both "are doing great," Nixon's rep said in a statement.

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This is the first child for Nixon, 44, and Marinoni, 43, who began dating in 2004 and got engaged in 2009. Nixon has two children — Samantha, 14, and Charles, 8 — from her previous 15-year relationship with photographer Danny Mozes.