Michael Buble is said to be expecting his third child with his actress wife Luisana Lopilato, according to reports in Argentinian press.
It is believed the couple have told relatives they are preparing to turn the page on son Noah's cancer drama by welcoming a new addition to their family.
Argentinian journalist Laura Ufbal broke the bombshell news by claiming Luisana, 30, was two and a half months pregnant and is preparing to tell family next month, reports Daily Mail.
Local media claim they are announcing at the end of March when she jets to her native Argentina with Michael, 42, and their sons Noah, four, and Elias, two, to promote the film where she stars as a police officer investigating human trafficking.
MailOnline has contacted representatives for Michael for comment. The couple have yet to comment on the pregnancy claims, which have been echoed across the Spanish-speaking world.
Luisana's actor brother Dario laughed and stumbled over his words when he was asked about the arrival of another niece or nephew during a recent TV interview.
Reportedly stifling a smile, he said: "I wouldn't be able to tell you... I swear the truth is I couldn't tell because I don't, I don't, I don't."
Breaking into nervous laughter as he was quizzed about his favoured name for the new arrival, he added: "When it comes to thinking about it, I prefer it to be something specific because you begin to get excited. So I really couldn't tell you."
Moments later he jokingly pretended to leave the interview after saying he was looking forward to a change of subject.
Michael, back to work after putting his career on hold to care for his sick son with his wife, is expected to join his family in Argentina after hosting the 2018 JUNO Awards in Vancouver on March 25.
Luisana has spoken of her desire to expand her family, admitting recently: "I would love to have another child because being a mother is the best role. I would love to have 20 children but my body wouldn't be up to it."
She fuelled the pregnancy claims rather than dampening them by posting a photo on Instagram last week showing her wearing a baggy sports top. Argentinian news website Todo Noticias described it as her "trick to hide her pregnancy".
One fan commenting on the photo said: "She put baggy clothes on to hide her stomach, even though she's not heavily pregnant yet... She's got her hands over her belly and her jacket is a size larger than the one she normally uses."
Michael Buble withdrew from hosting the Brit Awards and 2017 Juno Awards to focus on Noah's fight-back after he was diagnosed with cancer.
He and his wife were told their eldest son had cancer in November 2016 by a Los Angeles hospital after medics in Argentina said they thought the youngster with mumps.
He had chemotherapy and an op before his parents revealed in a Facebook statement last February: "We are so grateful to report that our son Noah has been progressing well during his treatment and the doctors are very optimistic about the future for our little boy."
Around the same time an Argentinian journalist went on TV to say Luisana's sister Daniela had told him in a text message: "The cancer has gone".
Noah is said to have been treated for liver cancer, although the actress and her husband have never confirmed what type of cancer he was diagnosed with.
Luisana opened up abut their son's cancer battle in an emotional TV interview last July with Argentina's leading chat show host Susana Gimenez.
She said: "Things like this that happen in life make you realise that the most important things are not what you think they are.
"The most important thing in life is to have faith and to be strong. There's not a day goes by that I don't go to bed at night praying to God, 'Please'. Thanks God the worst is now over but this is a long and ongoing process."