Nicole Kidman's 'flakiness' making Keith Urban grind his teeth in anger

Nicole Kidman and Keith Urban are again hit by split reports.

Nicole Kidman and Keith Urban
Nicole Kidman and musician Keith Urban arrive at the 2016 CMT Music Awards in Nashville, Tennessee U.S. June 8, 2016 Reuters

Nicole Kidman and Keith Urban's marriage is allegedly in trouble. The 50-year-old Academy Award winning star's certain habits is causing rift with the country crooner.

A source told Radar Online: "Nicole's flakiness aggravates Keith to no end."

"The older she gets, the flakier she becomes. She says she'll take care of something and then she doesn't. She's got so much on her plate that she can't keep track: career, kids, even her husband!" the insider said.

"She'll be talking to Keith on the phone long-distance, put him on hold and then forget about him. It makes Keith grind his teeth so much they'll be nubs if this continues," the source revealed.

Urban and Kidman married in 2006 and have two daughters, Sunday Rose and Faith Margaret. In an interview with the Australian magazine Women's Weekly, the Lion star revealed that she would give up acting for her family life with Urban. She said: "If it were the choice between my family and Keith, and my career, I wouldn't even bat an eyelid. The most important things to me are the love of our relationship and my children."

Previously, during an appearance on Channel Nine's The Today Show, Urban revealed he is upset with the break-up rumours. He said: "People make up the most insane crap, and we kind of just roll with it."

"It does [annoy me], I want to live our life together, and the fact we live somewhere where we're not being photographed all the time - it makes it possible for people to make up that stuff because you're not always there to defend it," he added.

"But then you get angry, 'Like why do I have to defend this?' The people who come and see us they don't read that stuff. It is gibberish," the multi-Grammy Award winner said.