Michael Buble's ex-girlfriend dishes on his pot use when they together. "Michael smoked up to three joints a day when I was with him," says Tiffany Broomley. "He always had a couple in his wash bag ready to go. He insisted it was his way of winding down at the end of a day. But sometimes he started the day with one."

The Canadian crooner won Best Traditional Pop Vocal Album for Michael Buble Meets Madison Square Garden at the 52nd Grammy Awards on Jan. 31, 2010.

Previously, Buble said about marijuana: "I grew up in Vancouver, which has the best weed in the world and good alcohol. You can score just walking down the street, so I did. I've never done cocaine or heroin or anything stronger. But I don't see anything wrong with relaxing with a joint."

Buble's currently engaged to model Luisiana Lopilato.

Grammys also went to to Jason Mraz, Kings of Leon, Stephen Marley, Ziggy Marley, Bela Fleck. Levon Helm, Steve Martin, Derek Trucks Band, Buckwheat Zydeco, Stephen Colbert, Booker T. Jones and Ramblin' Jack Elliot. Check out the complete winner's list here.

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