Perhaps distance does not make the heart grow fonder. There have been a slew of celebrity couples blaming marital woes on distance.
Sources say the stars barely get to see each other at the moment, which has made it difficult to work on their relationship.
"Tensions are reaching boiling point within their marriage. It's no secret that they're spending increasing periods apart, and Keith's close friendship with J-Lo won't have helped, especially as both Jen and Keith are returning to American Idol next season," an insider told British magazine Grazia.
"Nicole's had a lot on her plate with the panning that Grace of Monaco got, and it won't be helping if she no longer feels she can lean on Keith," said the insider.
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"It's fair to say communication doesn't seem great between them, to the extent that they're decreasingly talking face-to-face. Friends are wondering whether their eighth wedding anniversary will be their last."
Although the friend says the marriage is strained, Kidman has said she would give up acting for love.
"I have never had to; I would, absolutely. I wouldn't even think twice about it because I would hope there is something else I can do, and I would find something else to do. I think love is the core emotion, and I have certainly existed without that in my life, and it's a very empty life," she told the Australian magazine Women's Weekly.
"I have always said; when I won the Oscar [for The Hours], I went home and I didn't have that in my life. That was the most intensely lonely period of my life."
The couple married in 2006 and have daughters Sunday Rose and Faith Margaret together.
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