It was clear who is the centre of the cute tot's world as he planted kisses on Matthew's model love Camila Alves during a mother-son fishing trip to Malibu Creek.
But he'll soon have to share his Brazilian mum's attentions. She's expecting her second child, due in the early part of next year.
While she's been showing off her blossoming figure over the summer, the 27-year-old's baby bump was hidden under a warm sweater during her latest outing.
When he announced the happy news of the new arrival earlier this year Matthew was clearly delighted.
"Levi is going to be a big brother," he told fans. "Yeah, we pulled off the greatest miracle in the world one more time, Camila and I are expecting our second child, bringing more life into the world, making more to live for."