Wille Garson finalized the adoption of his 8-year-old son, Nathan, this week. Garson, known best as Carrie’s bestie Stanford Blatch in the television and movie series Sex And The City, began the adoption process a year ago through The Alliance for Children’s Rights and Westside Children’s Center. The paperwork was finalized on Wednesday.

“From the first time I met him, I said, ‘That’s my kid,’” Garson tells PEOPLE.

Garson — who currently stars on USA’s White Collar — appears alongside Sarah Jessica Parker, Kim Cattrall, Kristin Davis and Cynthia Nixon in Sex and the City 2, due in theaters May 28.