Hollywood heartthrob Matthew McConaughey is a father after his girlfriend Camila Alves gave birth to a baby boy on Monday.

McConaughey made the official announcement on his website and confirmed the news to OK! Magazine.

"A healthy baby boy was born," Matthew told OK! "Camila and I were side by side the entire time. We are both tired and elated, and are so happy to have created the greatest miracle in the world — Having a child and making a family. Now comes the greatest adventure — raising one, together."

The baby's name hasn't been released. He weighed in at 7 lb 4 oz.