Hilary Duff and her husband, retired hockey player Mike Comrie, welcomed son Luca Cruz on March 20.
Last night (March 22) Duff tweeted, "Welcome to the World Luca Cruz Comrie! Tuesday evening, we became proud parents of a healthy 7 pound 6 ounce beautiful boy."
The 24-year-old singer and actress continued, "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 and Comrie announced in August that they were expecting a child, just a year after the couple married on Aug. 14, 2010.