Sarah Jessica Parker's son is almost all grown up.

Get ready to feel ancient – because actress Sarah Jessica Parker is now the mother of a teenager.

Her eldest child, James Wilkie Broderick, turned 13 today.

The Sex and the City star marked the milestone by posting sweet throwback photos on Instagram.

Parker captioned the above photo with these words: "I might do this all day long. Cause I love himsez so. HAPPY BIRTHDAY JW! XXX, Mama."

She also posted a second cute photo of her with her husband, Ferris Bueller's Day Off actor Matthew Broderick, with James as a newborn.

That photo was captioned with, "A day I would happily relive. Over and over. Happy 13th birthday my favorite and beloved son. You bring us such enormous joy and we love you so. XXX, Mama and Papa."

Awww.

Parker and Broderick have been married since 1997. The couple also have twin daughters, Marion Loretta Elwell and Tabitha Hodge, were born via surrogate in 2009.

Happy birthday, James. And welcome to the teenage years...

Do you have teenagers at home? What advice do you have for others? 

TAP on the image below and scroll through the gallery to see more pictures of Sarah Jessica Parker and her family...