updated 02/05/2010 AT 8:00 AM ET
•originally published 02/05/2010 AT 8:35 AM ET
Actor Willie Garson is officially a father – after having begun the process of adopting his 8-year-old son, Nathen, a year ago.
The adoption, fostered by The Alliance for Children s Rights and Westside Children s Center, was finalized in Los Angeles on Wednesday, the Sex and the City actor, who currently stars on the USA Network’s White Collar, tells PEOPLE exclusively.
“From the first time I met him, I said, ‘That’s my kid,’ ” says Garson, 45. His biggest challenge so far as a single parent? Helping Nathen with his homework.
“He s in third grade, and I’m in the third grade,” jokes Garson, who reprises his role as Stanford Blatch – the best guy pal of Carrie Bradshaw (Sarah Jessica Parker) – in the upcoming Sex and the City 2, which hits movie theaters May 28.
– Monica Rizzo