Keith Urban snapped at a reporter for asking him questions about Nicole Kidman shortly before the couple announced their shock separation.

RadarOnline.com can reveal the country star, 57, was at pains to discuss his Hollywood star wife, 58, while promoting his music over fears she would become the "headline" of the piece.

Urban blasted: "I just don't want to give you guys a headline about my wife." Article continues below advertisement

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British Journalist Ed Potton, who works for The Times, recalled how the singer's easy charm evaporated the moment his estranged wife's name came up during a sit-down interview in Nashville last year.

Potton explained that the sig

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