Cynthia Nixon attends The New Group's 'Women Behind Bars' Reading at Acorn Theatre in New York earlier this month. (Photo by Slaven Vlasic/Getty Images)
"On May 27, 2012, Cynthia Nixon and her girlfriend, Christine Marinoni, were legally married in the state of New York," her spokeswoman said in a statement.
No further details were released.
Nixon, who found fame playing Miranda Hobbes on the hit HBO television show "Sex and the City" about single women navigating life, love and careers in New York City, has more recently appeared on TV programmes such as "The Big C."
She and Marinoni have been together for around eight years, and they became engaged in 2009 at a rally supporting same-sex weddings in New York. They have one son together.
