The mum-of-two posted a photo of herself playing at the beach with her little boy, many speculating it to be 16-month-old Elias.
“Mientras el me tira arena yo disfruto de sus carcajadas. #familyfirst #volverareir #mamasboy,” she penned in Spanish in the caption.
The note translates to: “While he throws me sand I enjoy his laughter.”
It's so nice to see the model smiling following a heartbreaking few months as they family rally around their older son Noah, three.
The carefree image follows the news that Noah is on the road to recovery after he was diagnosed with liver cancer.
Last month the Argentinian beauty gave an update on her little boy.
"Thank God, my son is well. When things like those that happened to us occur, your take on life changes," she said during a press conference in Argentina.
"It happened to us. Now I value life much more, the now and the today. I would like to thank people for their support, for the prayers they said, for their love, and I want them to know that they reached us and that it helped us a lot to come through this."
"My son's recovery is a long process as you all know and he has to continue with check-ups," she continued.
"But we are very happy. We are looking forward to thinking about the future, to seeing our children grow."
Meanwhile, the family are slowly picking up the pieces and resuming their life.
Making his first official public appearance next month, Michael Buble will accept Canada's National Arts Centre Award in Ottawa on June 28 from the Governor General of Canada.
The Centre's president said in a statement to ABC News, "We are delighted that Michael Bublé and his family are doing so well, and that they will all be joining us ... all of Canada wishes the Bublé family the very best."