Nicole Kidman refuses to sing in front of her musician husband. The 41-year-old actress - who is currently filming musical movie "Nine" - is far too embarrassed to show off her voice in front of country music star Keith Urban as she is afraid he would mock her.

She said: "I will never, never sing in front of him. I wouldn't even play him the track of me singing. Sometimes I might hum in front of him but that's it. Keith is pretty tough with that kind of stuff. He's highly musical."

Despite her musical fears, Nicole had a U.K. number one single when she duetted with Robbie Williams on 2001 song "Somethin' Stupid."

Nicole - who gave birth to Sunday Rose, her first child with Keith, earlier this year - recently revealed she was extremely anxious about starring in "Nine," despite having appeared in 2001 musical film "Moulin Rouge!"

She said: "I'm only working a couple of weeks in it and it's so lovely to have this rapport with other women. And it's nice to be singing and dancing again, but I'm really nervous to do it. Because I've just had a baby your body can't do certain things."

"They've adapted certain things for me, and for having the baby around the set. I've had her there the whole time and she knows all the songs and has given them the thumbs up. Of course, with Keith, she's surrounded by music - she's very at peace with it."

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