Mario Lopez, wife welcome baby No. 2

Extra and X Factor host Mario Lopez is a proud papa for the second time.

On Twitter in the wee hours, Lopez, 39, announced the happy news, writing, "It's a boy!!!!!!!!!!!!!! Please welcome Dominic Lopez to the world! Couldn't be happier... @CourtneyMLopez & baby are doing just fine... :)"

Lopez, 39, and wife Courtney Mazza are parents to daughter Gia Francesca, who turns 3 on Wednesday.