Hilary Duff and Mike Comrie's newborn son Luca is already a natural at photoshoots.

Duff has been tweeting photos of the little guy since he was born last month ... and just added a new picture showing the entire family together.

In the black and white shot, mom and dad are smiling as Duff holds her little bundle of joy.

Hilary has been tweeting up a storm about being a new mom too -- writing yesterday "No better feeling that a peaceful baby sleeping on your chest...wonder what he's dreaming about? #happymommy"

Check out more cute kids above!

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