Showbiz
Rex Features
Alves gave birth to a boy in Los Angeles on Monday at 6.22pm, according to People. The name of the child is not yet known.
A friend of the couple commented: "They're so happy!"
McConaughey, who started dating Alves two years ago, confirmed the pregnancy on his website last year.
He said: "Camilla and I made a baby together. We are stoked and wowed."
More: Matthew McConaughey, Showbiz
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