Michael Buble's says his pregnant wife Luisana Lopilato is "killing" him with baby name ideas. Credit: Michael Buckner/AMA2010/Getty

For Michael Buble, conceiving his first child with wife Luisana Lopilato was anything but romantic. "There was nothing sexy about it," the singer revealed on BBC America's The Graham Norton Show Apr. 18. "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.'"

The Grammy winner and the Argentinian actress, who are expecting a baby boy, have been butting heads over what to name their firstborn. "My wife is killing me. We fight about the names," Bubble admitted. "She keeps coming up with names that she thinks sound good in Spanish, like 'Dirt.' Dirt Buble!"

Luckily, the spouses have a few more months to reach an agreement. In the meantime, Buble will continue to sing to Lopilato's baby bump. "I was doing it early on -- really early on -- and I didn't know because I've never had a baby before," the Canadian crooner said. "In the middle of singing, my wife starts laughing and says, 'The baby is two months and has no ears to hear you!'"

Buble, 37, married Lopilato, 25, in a small civil ceremony in Buenos Aires on March 31, 2011. Days later, the couple tied the knot in front of 300 friends and family in their second set of nuptials. Their third wedding ceremony took place in May 2011 at Vancouver's Pan Pacific Hotel.