has opted out of hosting the BRIT Awards in London next month.
The awards show, which is the U.K. equivalent of the GRAMMYs, could have been the biggest gig of Buble's career, but ET Canada has confirmed
the Canadian singer is backing out to care for his 3-year-old son, Noah, who was diagnosed with cancer last year.
Buble, 41, and wife Luisana Lopilato, 29, announced their son's diagnosis in November via Facebook.
"We are devastated about the recent cancer diagnosis of our oldest son Noah who is currently undergoing treatment in the U.S.," their statement read. "We have always been very vocal about the importance of family and the love we have for our children."
The message went on to say that Buble and Lopilato, an Argentine actress and model, would be taking a break from the entertainment industry to ensure the well-being of their firstborn child.
"Luisana and I have put our careers on hold in order to devote all our time and attention to helping Noah get well," the statement added.
Still, Buble was expected to return to the stage on Feb. 22 for the event.
Reps for the BRIT Awards and Buble did not reply to requests for comment.
While little is known about Noah's health today, the report that Buble canceled his hosting gig should not be taken as a sign that Noah is doing worse. At the time of the diagnosis, it was reported that Noah had a 90-percent chance of survival.
In fact, Noah was reportedly able to spend Christmas with his family at home in Los Angeles and not in the hospital.
Last year, ET's Jennifer Peros spoke exclusively with Buble about the love he has for his sons, Noah and Elias, who turns one on Jan. 22.
"I love them more than I'll ever love anything, or anyone in the whole universe," he said. "I think it gave me perspective on life that I think I very badly needed. It's hard to be able to quantify that level of love. I didn't know that level of love existed, but it makes me better at everything."
At the time, Buble also opened up about the fears that come with being a parent.
"You're scared all the time, because you love them so much that you can't ever think of a world without them," he told ET. "You try not to even think about it."
While the GRAMMY winner is staying focused on his family, he is getting support from Derek Hough. Hough, who met Buble in 2009 when he performed on Dancing With the Stars, is directing, choreographing and starring in the music video for Buble's new single, "I Believe in You."