AceShowbiz - Michael Buble is the latest celebrity to appear in the latest episode of Carpool Karaoke of "The Late Late Show with James Corden". The "It's a Beautiful Day" hitmaker joins forces with host James Corden and Stand Up to Cancer U.K. for a good cause to help raise funds for cancer research.

During the episode the two look like having so much fun as they sang "Haven't Met You Yet". But things escalate quickly as their hangout gets NSFW. When James bring up about his days when Michael was bigger, the "Home" hitmaker confessed that losing weight makes his penis look bigger.

"When I was at that weight -- I don't know, when you were smaller, your penis looks bigger," he says after James shows him a photo of Michale when he was bigger. "Is that wrong? Because when you're bigger like that it looks like a buoy sitting in the middle of an ocean."

But Michael, who shares Noah Buble, Elias Buble and Vida Amber Betty Buble with wife Luisana Lopilato, adds that he doesn't really care about how he looks. "I got my beautiful woman who loves me," he tells James. He has a point!

Later, they continue jamming out to some of Buble's biggest hits and even partake in a scat contest with Corden's father.

The last few years have been tough for Michael and wife Luisana. The couple's 4-year-old son Noah was diagnosed with cancer. After singing "Love You Anymore", the singer addresses the hard times. "My whole life ended," the singer recalled, before calling his son a "real superhero." The two conclude their Carpool Karaoke segment with a sweet rendition of "Home".

The Grammy-winning singer is set to drop his eighth studio album "Love" on November 16.