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The month-old tot – who has also been to a rock concert – was rushed by dad down the red carpet and into the launch party for Muxo, a luxury handbag collection designed by Alves and her mother, Thursday night.
"He's a very well-behaved baby," Kitson owner Fraser Ross told PEOPLE. "Camila's adorable [with him]."
Levi spent the evening in a private room with a nanny, but did get several visits from mom and dad.
"Camila and her mom have been working on putting [Muxo] together for years, and then all of a sudden it's like ka-boom," McConaughey, 38, told PEOPLE. "It's great. Tonight's just about celebrating."
The support for Alves, 25, was shared, as was congratulations. "We are here for Camila, and for the baby," said friend and designer Christian Audigier. "We have not given her the present yet. We will give it to her tonight. It's a surprise, I cannot tell you."
