Keith Urban's marriage to Nicole Kidman was blemished by cheating rumors yet again.

In an item on the National Enquirer, details about a recent sighting of the "John Cougar, John Deere, John 3:16" singer with a blond women was revealed. According to the gossip, the incident happened in Oct. 10 in San Francisco, California.  

"This woman had a sparkle in her eye when Keith led her through the valet entrance," an onlooker told the source above. "There was definitely chemistry between them."

"It's bound to upset Nicole; these things seem to be becoming more and more frequent the longer Keith spends on the road away from his family!" the onlooker added.

The cheating rumor that was first reported by Woman's Day Australia has been denied by Urban's rep according to the Enquirer.

In August, Keith Urban's marriage to Nicole Kidman was also stained by cheating accusations with country singer Kelsea Ballerini but according to Gossip Cop, reps of the couple denied the rumor.

The "Photograph 51" actress has also recently opened up that she and her "John Cougar, John Deere, John 3:16" singer husband have made their marriage and time with the family a priority often jet setting just to spend time with each other as opposed to the rumors that the country singer has always been away from family.

She has also told Mail Online that they make it a point to be all together as family for as not as far as seven days as their kids "don't like the separation." The couple were together in London last Oct. 27 for the "John Cougar, John Deere, John 3:16" singer's birthday as told by Just Jared.

Rumors has always been a part of Keith Urban and Nicole Kidman's marriage but they seemingly don't let it affect them. The "Photograph 51" actress though does take advantage of personal struggles and translate it to her acting.

"Yeah, but we're taught to bring everything-the state of being, the environment-and use it," the "Photograph 51" actress told Lee Daniels for Interview magazine when asked about her personal struggles bleeding into work sometimes.

The "Photograph 51" actress recently portrayed a woman under some marriage struggles in "Strangerland" and she said she's surprised by how she's able to portray it.

"I don't know where I get it from," the Oscar-winning actress admitted to the Irish Examiner. "There is something that compels you to play a role and probably it's so personal that it's difficult to dissect. It's kind of the work and I leave it at that."