Hilaria Baldwin is about to be the proud mom of a baby boy — again. But she's still smitten with her first son, Rafael, who's just nine months old, judging from the pic she posted on Instagram.

"Guess who said 'mama' today???? #FirstWord," she captioned the snap.

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Guess who said "mama" today 😍??? #FirstWord

A post shared by Hilaria Thomas Baldwin (@hilariabaldwin) on

The Spanish-born Hilaria, 32, and husband Alec Baldwin announced they're expecting baby no. 3 on Wednesday and admitted he was a surprise. Aside from little "Rafa," as they call him, they're also parents to super-cute daughter Carmen, 2 1/2.

"We wanted to have another one, maybe not so soon, we thought about taking a year or two off," the 30 Rock actor, 57, told Extra. "This is it, we're going to have one more, then we're going to enjoy them, all three of them."

Hilaria is due in the fall and says she's been suffering from some morning sickness.

"I’ve been pretty nauseous, so I was surprised it was a boy, 'cause I felt really nauseous with Carmen and less nauseous with him," she told Extra. She stopped short of revealing possible baby names, however.

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What's especially sweet is seeing how much Alec is enjoying being a dad to little ones again. He has a 20-year-old daughter Ireland with ex-wife Kim Basinger.

"I like doing this, I like having kids," he gushed. "I just can't describe what it means to me."

Aww!