Alec Baldwin
got an early birthday present this weekend -- a new fiancee!

Baldwin, who turns 54 tomorrow, reportedly popped the question to his 28-year-old girlfriend Hilaria Thomas over the weekend ... and she said "Yes."

A rep for the "30 Rock" star confirmed the news to The Huffington Post.

This will be Baldwin's second marriage. He was married to Kim Basigner from 1993-2002 and they had one child together, 16-year-old daughter Ireland.

It's the first marriage for Thomas, a yoga instructor.

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