Kelly Clarkson's DIRTY DIVORCE!

Battle blazes as ex squeezes 'Idol' for millions!

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SONGBIRD Kelly Clarkson is gearing up for an ugly divorce, after estranged hubby and manager Brandon Blackstock has demanded millions from her in a shocking new lawsuit, sources snitched.

The “Miss Independent” singer filed for divorce from Brandon, her husband of seven years, in June.

Though the couple has tried to keep things civil, insiders claimed the mudslinging has already begun!

Pals said the original “American Idol” champ, who shares daughter River, 6, and son Remington, 4, with Brandon, was stunned when she was slapped with a lawsuit claiming she owes at least $1.4 million to Starstruck Management Group — the company her husband works for, which is run by his 64-year-old father, Narvel.

A source said: “Kelly is outraged Brandon has sunk so low as to demand millions from her in a separate suit.