LOS ANGELES — Matthew McConaughey's longtime model girlfriend, Camila Alves, has given birth to the couple's first child, a 7-pound, 4-ounce boy.

Alves, 24, gave birth Monday night in California, McConaughey's publicist, Alan Nierob, said in an e-mail Tuesday to The Associated Press.

The 38-year-old actor announced that Alves was pregnant in a posting on his Web site in January.

"Camila and I were side by side the entire time," McConaughey told OK! magazine. "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."