Alves wore yoga pants, black sneakers and a loose-fitting top for the casual outing. She gave the first glimpse of Livingston as she swaddled him in a blanket. This is the second time Alves has been photographed in public since her son's arrival; she was photographed with son Levi, 4, and daughter Vida, 3, in the same city Jan. 25.
The Brazilian beauty and McConaughey tied the knot after six years of dating in June 2012. The couple announced Livingston's birth via Facebook on Dec. 29, 2012. "He greeted the world at 9 lbs. and 21 inches," McConaughey, 43, wrote. "Bless up and thank you for your well wishes."
Alves, who also designs a line of handbags, shared her elder children's latest milestones with Us Weekly in September 2012. "They're back in school now and they're just so much fun," she gushed. "They're at that stage where everyday there's something new. Vida has more personality than I can explain to you. She's very sassy -- it's great!"