Michael Buble's holiday romp solved baby woes

Singer Michael Buble and his model wife Luisana Lopilato drew up a baby-making schedule when they were trying to start a family, but finally conceived during a wild night of unplanned passion.

The Canadian crooner wed Lopilato in 2011 and the couple was so determined to start a family, they made sure they would find time for romance at the optimum moments each month.

Their carefully planned schedule failed to work, but they were stunned when an impromptu, drunken romp during a trip to Italy finally helped achieve their dream.

Buble tells U.K. talk show host Graham Norton, "It worked! The sex worked!... There was nothing sexy about it. My wife is so beautiful but it wasn't like that. She was very, 'You know what Mike, it's nine o'clock on Tuesday night and we must do it now.' But, you know what's funny, I think when we conceived was actually when we were wasted (drunk) in Milan and it was the one night we just had drunk awesome sex!"