"Extra's" Mario Lopez and girlfriend Courtney Mazza welcomed a healthy baby girl, Gia Francesca Lopez, weighing in at 6 lbs, 4 oz, on Saturday, Sept. 11 in Burbank, CA. Mother and baby are doing well.

"We are so overjoyed. What an amazing, wonderful and overwhelming experience to welcome our daughter into the world," Mario told "Extra."

See baby pics of Mario and Courtney

Sneak peek! Mario and Courtney's Baby Nursery

Lopez, 36, and his girlfriend, actress Courtney Mazza, 28, met in 2008 when the two starred in "A Chorus Line" on Broadway.