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In honor of Trans Day of Action, Cynthia Nixon shared a touching Instagram post to celebrate her oldest child.。

On Friday, the 。 Sex and the City 。 star — who's currently running for governor in New York — shared a photo of her and her son Samuel, announcing that he's transgender.。

SEE ALSO:Don't know how to open up about your mental health? Lady Gaga's mom has some advice.。

"I’m so proud of my son Samuel Joseph Mozes (called Seph) who graduated college this month," Nixon wrote. "I salute him and everyone else marking today’s #TransDayofAction. #TDOA."。

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Nixon had Samuel, born Samantha Mozes, with her ex-husband Danny Mozes, along with her 15-year-old son Charles Ezekiel Mozes. She also has a 7-year-old named Max Ellington Nixon-Marinoni with her wife, Christine Marinoni.。

In addition to participating in LGBTQ advocacy for more than 10 years, Nixon herself has publicly identified as bisexual and was honored with the Human Rights Campaign’s Visibility Award in Feb. 2018.。

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In a statement, HRC President Chad Griffin, called Nixon, "a fearless and outspoken advocate for all LGBTQ people."。

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In a statement, HRC President Chad Griffin, called Nixon, "a fearless and outspoken advocate for all LGBTQ people." 。

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