Nicole Kidman says she was 'a goner' when Keith Urban turned up at 5am on her birthday with flowers

Nicole Kidman has revealed the sweet moment her husband of 15 years, Keith Urban, first swept her off her feet.

The Aussie actress told Jimmy Fallon during an appearance on The Tonight Show Starring Jimmy Fallon that it was an early morning visit on her birthday which did the trick.

"He sat on the stoop of my New York apartment, I came out, it was 5am in the morning and it was my birthday, and he had flowers," Kidman recalled of June 20, 2005.

"And that was it. I was a goner. I'm like, 'Yes I'll marry you'," she added.

It's not known if that was the moment Urban proposed to the Hollywood star or just the minute she realised she wanted to marry the country singer.

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The couple, who first met at G'Day LA in 2005, married on June 25, 2006 in Sydney.

Fallon then congratulated the pair on their recent 15th wedding anniversary.

"For a second there, I thought you said 50 years," Kidman laughed, before adding: "Hopefully one day, but 15 years, which is pretty amazing, right?"

Jimmy tried to get the actress to divulge on how the couple celebrated their relationship milestone but Kidman kept details of the celebration private.

However, one thing they won't be doing to mark any milestones is create an album of duets together — with the actress horrified by the suggestion.

While Kidman has sung in musicals like Moulin Rouge and Nine as well as a duet with Robbie Williams, she says she's not confident as a performer and would rather "stay in my lane" and leave the music to her hubby.

Kidman previously told People magazine in a 2019 interview that her 38th birthday was the day she knew he was the one for her.

"I believed by that point he was the love of my life," the actress said.

"Maybe that's because I am deeply romantic, or I'm an actress, or I have strong faith as well, but I just believed, 'Oh, okay, here he is.'"

And speaking of their relationship in 2007 with Vanity Fair, the actress described it as the right timing.

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"I would probably say that two very lonely people managed to meet at a time when they could open themselves to each other. We were a mixture of frightened and brave."

The couple share two daughters together Sunday Rose, 13, and Faith, 10.

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Looking back on Nicole Kidman and Keith Urban's love story as the world reels from their split