Matthew McConaughey and girlfriend Camila Alves welcome a baby boy

Matthew McConaughey and girlfriend Camila Alves welcomed a son Monday night, his rep Alan Nierob confirmed to PEOPLE magazine. The first baby for both parents was born at 6:22 p.m. in Los Angeles, weighing in at 7 lbs., 4 oz.

“They're so happy!” said a close friend.

McConaughey's oldest brother, Rooster, equally delighted: “Oh, it's going to be fun!” he told PEOPLE. “He'll make a really good dad because he's got a lot of patience. I'm excited for him. It's about time.”

A model and handbag designer, Alves plans to take a break now that she's had the baby. “More important than anything is that I have a peaceful life and a peaceful home,” she said.