Matthew McConaughey and his wife Camila Alves have another reason to celebrate this holiday season -- they welcomed a new baby into the family!
A source tells ET the Magic Mike star was present for the baby's birth Friday at a hospital in Austin, TX.
On Saturday, he shared the happy details with the world, writing on Whosay: "Camila (@iamcamilaalves) gave birth to our third child yesterday morning. Our son, Livingston Alves McConaughey was born at 7:43am on 12.28.12. He greeted the world at 9lbs. and 21 inches. Bless up and thank you for your well wishes. Happy New year, and just keep livin, Camila and Matthew McConaughey."