Canadian crooner Michael Buble’s eldest son, Noah, has reportedly started chemotherapy for what’s believed to be liver cancer.

(Michael Buble  Facebook)

Apparently doctors feel the three-year-old has a 90% chance of beating it after four months of treatment.

Noah Buble’s being cared for in L.A.

The 41-year-old Buble and his 29-year-old wife Luisana Lopilato announced on Facebook last week that they’re ”devastated” but are putting their careers on hold in order to devote all their time and attention to helping Noah get well.

The couple also have a younger son, Elias.