The couple opted to keep the sex of the baby a surprise until he was born.
This anticipation is killing me...September 10, 2013
Lopez had to rush to the delivery room from the set of "The X Factor" once he learned his wife was in labor.
"Whoa. Cutting it close," Lopez, 39, wrote. "Just wrapped @TheXFactorUSA & I'm rushing to the hospital. Baby Lopez #2 is coming tonight! Baby better wait for me."
He revealed the name and sex of the baby on Twitter shortly after Dominic was born.
It's a boy!!!!!!!!!!!!!!— Mario Lopez (@MarioLopezExtra) September 10, 2013
Please welcome Dominic Lopez to the world! Couldn't be happier... @CourtneyMLopez & baby are doing just fine... :)
Now their daughter Gia is big sister to baby Dominic Lopez. Fellow "Saved By The Bell" stars have sent congratulatory tweets all day. Gia will turn three on Thursday.