Kidman's ultimatum to Urban

Nicole Kidman and Keith Urban

New Zealand-born country singer Keith Urban's trip to rehab was at the insistence of his wife Nicole Kidman, according to a US magazine report.

Life & Style magazine says the Aussie actor gave Urban an ultimatum: deal with his addiction and embrace the marriage - they wed four months ago - or buzz off with a bottle of booze.

"Keith can't stand the thought of life without Nicole," said an anonymous source. "That's his motivation to kick this thing for good."