Michael Buble reveals 3-year-old son's cancer diagnosis

Singer Michael Buble (L) and Luisana Lopilato walk on the red carpet for "Tony Bennett Celebrates 90: The Best Is Yet to Come" at the legendary Radio City Music Hall in New York, U.S., September 15, 2016. (Reuters)

Michael Buble's 3-year-old son has been diagnosed with cancer.

The singer revealed the sad news in a Facebook post Friday.

"We are devastated about the recent cancer diagnosis of our oldest son Noah who is currently undergoing treatment in the US," the singer and his wife Luisana Lopilato wrote. "We have always been very vocal about the importance of family and the love we have for our children."

Buble said he and his wife are putting their "careers on hold in order to devote all our time and attention to helping Noah get well."

He asked for prayers and for the public to respect their family's privacy during this time.

"We have a long journey in front of us and hope that with the support of family, friends and fans around the world, we will win this battle, God willing."

This is not the first time Noah has had medical issues. In June 2015, when he was 22-months-old, Noah was rushed to a hospital in Argentina after he suffered burns from being scalded with hot water. He was treated and brought home the following month. 

Buble and his Argentine actress wife married in 2011. In addition to Noah, they welcomed son Elias in January 2016.