One of the stars of Sex and the City is hanging up her single-girl credentials and getting hitched. Cynthia Nixon announced her engagement to long-time girlfriend Christine Marinoni at a rally supporting same-sex marriage in New York on Sunday. At the rally, which was also attended by New York Governor David Paterson and Mayor Michael Bloomberg, Nixon showed off her engagement ring and said, “It’s time already.” Nixon began dating Marinoni in 2004 after she left Danny Mozes, her partner of 16 years and father of two of her children. Where will the pair marry? “In an ideal world, we’d like to in New York, when it becomes legalized,” said Nixon.