Leave it to Michael Buble to pull music mogul David Foster out of retirement.

Though the Grammy-winning super-producer, 68, seemed to have called it a day on making new records, Buble exclusively tells ET Canada’s Cheryl Hickey how a conversation about his son Noah’s cancer battle helped reel his frequent collaborator back into the studio.

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The 42-year-old crooner recalls, “[David] just asked me how I was doing, and I told him the whole story, and I said, ‘Man, you ever think of coming back?’ ‘Cause you know, he retired.”

He continues, “I said, ‘You know, David, the only way I could even think of coming back is if there was no drama. I just don’t wanna work that hard. I don’t. I want it to be joy – pure. I want it to have musicality and humanity, and I want it to be bliss.”

It seems the passionate answer struck a chord with Foster, resulting in their musical reunion on Buble’s upcoming album, which he confirms is complete but remains untitled.

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“I think it was a little spark,” he says. “We both looked at each other and went, ‘Wanna get back into bed together?'”

Buble even jokes that their relationship is so strong, it even rivals the one between Foster and recent fiancee Katharine McPhee!

“People don’t know that I was almost his fifth [spouse],” he quips.

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For more with Michael Buble, watch our “Pop Star Confessions” below.