"You'd think she killed someone," Bublé, in Australia to promote his album Crazy Love, told Melbourne's Herald Sun newspaper. "Okay, she lip-synchs her show, people know that, they make the decision if they want to go and see her do that."
He added, "Does she deserve the way she's been completely bashed by the media here? No."
One report Spears's camp objected to: that fans were so unhappy with her concerts that they walked out of at least one show in droves. Bublé says he find the criticism of Spears "nasty."
Although, the crooner does have a sense of humor about it. "Mind you, I lip-synch all my concerts," he said joking. "I'm the Milli Vanilli of jazz."
Bublé, 34, also discusses one blip in his relationship with his girlfriend, Argentine actress Luisana Lopilato, 22, a star in her native South America.
"My Spanish is not great," Bublé admits. "I'm learning slowly. She's showing me up. Her English is flawless, I sound like a caveman when I try to talk Spanish."