He's only two weeks old, but Hilary Duff's baby boy Luca Cruz Comrie just posed for his first TwitPic!

The proud mama shared the first photo of her and husband Mike Comrie's newborn son on her Twitter, two weeks after his birth.

While Duff had previously teased her followers with a photo of Luca's little feet, she revealed her adorable tot moments ago.

Duff gave birth on March 20 -- and used her own website to announce the news.

"Tuesday evening, we became proud parents of a healthy 7 pound 6 ounce beautiful boy," she said at the time. "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."

Isn't he cute?! Congratulations to Hilary and Mike!

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