UPDATE 8/23/2013 5:31 p.m. PST: Alec Baldwin's a dad, again! He and wife Hilaria announced the birth of a baby girl via Twitter earlier this afternoon. "We are overjoyed to announce the birth of our daughter Carmen Gabriela. She is absolutely perfect. @ABFalecbaldwin @IrelandBBaldwin," the new mom tweeted. Congratulations to the parents and big sister Ireland!

Alec Baldwin is about to welcome his second child, 17 years after his first.

His wife, Hilaria, is at the hospital and due to give birth any moment, reports Page Six.

Alec was spotted arriving with "heavy bags" at Mount Sinai Hospital in New York City today, August 23.

A source tells the site that "the baby hasn't arrived yet, but it could be any moment."

The girl will be the first child for the happy couple. The 30 Rock star wed Hilaria, a yoga instructor, in June 2012.

The 55-year-old Emmy winner is also dad to 17-year-old Ireland Baldwin, whose mother is Alec's first wife, actress Kim Basinger.

Congrats in advance to the expanding family!

Sources: Page Six and Hilaria Baldwin on Twitter

Dan Clarendon is an assistant editor at Wetpaint Entertainment. Follow him on Twitter and Google+!