Keith Urban smoked crack cocaine in his drug dealer's bathroom during the height of his addiction, Woman's Day has reported.

From 1994 to 2001, former dealer David Dobson supplied drugs to the country music singer.

In an interview with the publication on Monday, David has claimed Keith was so addicted to crack he would do things the drug dealer was "totally against".

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"He'd say, I'm gonna take a shower, and you'd hear him in the bathroom with a lighter doing crack"' David said.

"I'd get mad and go, 'Quit doing that s**t in my house!'."

"She's doing something to be keeping those demons off him," he said of Urban's wife Nicole Kidman. "I just don't know if it'll last."

But the couple has battled their share of Keith's drug demons.

Nicole Kidmanand Keith Urban arrive at the 50th annual CMA Awards at the Bridgestone Arena. Photo / AP
Nicole Kidmanand Keith Urban arrive at the 50th annual CMA Awards at the Bridgestone Arena. Photo / AP

Only months after their fairytale wedding in 2006, Keith was in rehab after suffering a relapse.

Last week, Nicole opened up about her husband's struggles with addiction, saying it was ultimately up to Keith to save himself.

"At some point, you just have to say, 'I love you and I'm here when you decide to do the work. If you don't, then that's it'," the 49-year-old told People magazine.

Keith, 49, opened up about his drug use to Rolling Stone magazine in June, telling the publication that he first smoked freebased cocaine - a purer form of crack cocaine - in the 1990s after he was offered it by a roommate.

"And then one day he offered me this massive pipe," he said.

"I'd never had it, it looked good, so I took it. Things didn't immediately go pear-shaped, but that was the beginning of it."

Daily Mail Australia has contacted Keith Urban for comment.