Britney Spears' father Jamie is furious at the amount of legal fees his daughter's custody fight with ex-husband Kevin Federline has garnered - and is planning to contest the $1.1 million invoice at a court hearing next week.

Jamie Spears was appointed conservator of the pop star's legal and financial affairs in February and is in charge of her estate - with court-appointed observer Andrew Wallet - until July 31, after he was granted an extension on Wednesday.

But Jamie is reportedly disputing the high attorneys' fees he has been billed for - $500,000 from Federline's lawyer Mark Vincent Kaplan, and more than $600,000 from Britney's representatives Trope and Trope - for work carried out in the last five months, from October to February.

According to TMZ.com, Jamie has filed documents with Los Angeles Superior Court to challenge the invoice and a hearing is set to take place on Monday - on the same day Spears is due to face her ex in a child custody/visitation case.

(This news article provided by World Entertainment News Network)