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

Australian power couple Nicole Kidman and Keith Urban are again hit by reports that their marriage is in trouble. The couple is allegedly drifting apart and leading separate lives.

A source told Star magazine: "It's sad to say, but I believe Nicole and Keith have actually been happier apart."

"Because on the rare occasion they can spend time together, they end up bickering over the slightest little thing, and it gets exhausting," the insider added. "I wouldn't be at all surprised if they released a joint divorce announcement soon."

The source continnued: "It's devastating, but these last few months have been like a trial separation for Keith and Nicole. I think it may only be a matter of time before they formally split."

Urban and Kidman have been married for nearly ten years and have two daughters, Sunday Rose and Faith Margaret. Kidman was previously married to Tom Cruise and divorced him in August 2001 after 11 years of marriage. The actress adopted two children with Cruise while they were married.

Meanwhile, in an interview with the Australian magazine Women's Weekly, Kidman 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."