Sex And The City actor Cynthia Nixon shares pic of 'proud moment' on transgender son's graduation ceremony

Sex and the City actor-turned-activist Cynthia Nixon has revealed her son Samuel is a transgender.

The candidate for New York governor, 52, shared an empowering message to her son on Instagram during Trans Day of Action, June 22, with a throwback photo from his graduation earlier this month from the University of Chicago.

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

 

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

A post shared by Cynthia Nixon (@cynthiaenixon) on Jun 22, 2018 at 12:39pm PDT

Samuel, 21, was born Samantha Mozes. Nixon shares Seph and 15-year-old son Charles Ezekiel Mozes with ex-husband Danny Mozes.

The former "Sex and the City" star is also mother to Max Ellington Nixon-Marinoni, 7, with her wife, Christine Marinoni.

Nixon is a staunch advocate for LGBTQ rights, writing in a 2015 Variety op-ed about marriage equality, "We have to keep organising like our lives depend on it."