Faith And Tim Tangle In Marriage Hell!

Brutal war breaks out as daughters leave the nest!

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COUNTRY royalty Tim McGraw and Faith Hill are locked in a no-holds-barred showdown over whether she should tag along on his upcoming solo concert tour — leaving friends fearing their already shaky marriage is now on the road to the chopping block!

Insiders note that while Tim and Faith, both 52, had their children to cement their marriage in the past, daughters Gracie, 22, and Maggie, 21, are grown, and Audrey, 17, is about to graduate high school and leave them with an empty nest.

“Tim and Faith have been on the brink of splitting up several times, but they’ve always managed to pull it together for the sake of their family,” a friend snitches.

With no kids as marriage glue, a pal says the celebrity songsters, who marked their 23rd wedding anniversary Oct. 6, “have been locking horns on their future” — and fueling concerns they’re on the rocks and headed for a ferocious $167 million divorce battle.

“There’s no guarantee for the future for Tim and Faith — and Faith isn’t going to give in easily if they end up in divorce court,” predicts the pal.