Matthew McConaughey reveals baby son's name: Livingston!

Just keep Livin ... gston!

Matthew McConaughey and Camila Alves have named their new baby son (not a daughter, as Us Weekly originally reported) Livingston Alves McConaughey.

The actor and his wife shared the details about their new bundle of joy on Whosay Saturday (Dec. 29):

"Camila 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."

Livingston has an older brother, Levi, 4, and sister, Vida, who turns 3 on Jan. 3.