sgellar020612_04_X17.JPGSarah Michelle Gellar and husband Freddie Prinze Jr. welcomed a baby boy back in September, and they're just now revealing his name: Rocky James Prinze!

Gellar, 35, and Prinze, 36, who were married in September 2002, also have a three-year-old daughter, Charlotte Grace.

“They are thrilled that Charlotte [has] a little brother,” a source close to the couple told People back in July.

“They love their little girl more than anything in the world and know that love will only multiply.”