Hilary Duff gives birth to a baby boy

Looking for a sign we're all getting a little older? Hilary Duff and husband Mike Comrie are proud parents of a bouncing baby boy.

The former "Lizzie McGuire" actress writes on Twitter, "Welcome to the World Luca Cruz Comrie! Tuesday evening, we became proud parents of a healthy 7 pound 6 ounce beautiful boy. We are overjoyed and feel like the luckiest parents in the world. He is surrounded by so much love!! Mom and baby are both doing extremely well."

Duff, 24, announced in Aug. 2011 that she and Comrie were expecting. At the time she writes on her website, "We also want to share the exciting news that... BABY MAKES THREE. We are extremely happy and ready to start this new chapter of our lives."

Comrie, a recently retired professional hockey player, wed Duff in Aug. 2010.

Luca is the first child for the couple.