It's official! Alec Baldwin just become a dad for the second time.
On Friday, the 55-year-old actor and his wife Hilaria welcomed their very first child, a daughter named Carmen.
Pics: Celebs and Their Cute Kids!
The new mom, 29, posted the announcement a little before 8 p.m. East Coast time.
Baldwin's daughter Ireland (from a previous marriage to actress Kim Basinger) quickly responded to the good news.
"Welcome to the world, Carmen! I'm a f*****g sister," she wrote .
Related: Alec Baldwin Tweets Intimate Wedding Photo
Speculation about the impending birth spread earlier in the day as Alec and Hilaria were spotted arriving to New York's Mount Sinai Hospital.
The pair wed at St. Patrick's Old Cathedral in New York on June 30, 2012, three months after announcing their engagement. Hilaria's pregnancy was confirmed in early February.