Kelly Clarkson has claimed her estranged husband defrauded her out of millions of dollars.

Kelly Clarkson

Kelly Clarkson

The 'Because of You' hitmaker filed legal documents with the California Labour Commission in October in which she alleged Brandon Blackstock and his father Narvel's company, Starstruck Management, had charged her outlandish fees during her 13 years with the firm.

According to documents obtained by Us Weekly magazine this week, the 38-year-old star claimed her agreement with the management company was a “fraudulent and subterfuge device” that allowed her managers to perform “illegal services” as agents.

Kelly also alleged both Brandon - who she split from in June - and Narvel were not licensed to be agents in California so she wants to recoup all the money she paid the firm.

It was previously reported that the 'Voice' coach was countersuing the company and had alleged they had violated the California Labour Code because they were not properly licensed when "procuring, offering, promising, or attempting to procure employment or engagements.”

Kelly also claimed the company violated the Talent Agencies Act several times and argued all agreements should be “declared void and unenforceable,” including a verbal agreement that requires 15 percent commission on her gross earnings.

Her countersuit came after Narvel filed a lawsuit against the 'Behind These Hazel Eyes' singer in September, alleging she owed the firm $1.4 million in unpaid commissions from her work on 'The Kelly Clarkson Show' and 'The Voice' for 2020.

Last month, Kelly was awarded primary physical custody of her and Brandon's two children, River, six, and Remington, four, though the former couple will share joint physical and legal custody of both kids.

Brandon also has Savannah, 18, and Seth, 13, from his previous marriage to Melissa Ashworth.