"My girlfriend Camila and I made a baby together ... it's three months growing in her womb and all looks healthy and lively so far," the actor wrote. "We are stoked and wowed by this miracle of creation and this gift from God, and so excited for the adventure that will come in raising this child, being mother and a father, and shepherding him or her through this life. ...
Wish us the best, keep us in your prayers, and God bless evolution. Thanks for being fans of me and my work and now this new and miraculous chapter in my life, as me and Camila and our child do our best to just keep living."
He has reportedly been dating Alves for more than a year.
"He is euphoric. He couldn't be happier," McConaughey's spokesman Alan Nierob told People.com.
2014: The Year in Music [PHOTOS]