LOS ANGELES - Britney Spears has been ordered to pay US$120,000 in legal fees to ex-husband Kevin Federline, who was awarded temporary custody of their young sons.

Superior Court Commissioner Scott Gordon ordered the pop star to pony up that much of the $154,500 in legal fees that Federline owes to his lawyer, court papers filed Tuesday show.

Gordon made the decision after considering factors including "the notable disparity between the parties' income," the ruling said.

A call to Spears' lawyer was not immediately returned.

Court papers released last week show Spears makes roughly $737,000 a month and spends lavishly on clothes and entertainment. Meanwhile, Federline "indicates that he does not earn any income," the ruling said.

Federline, father of two-year-old Sean Preston and one-year-old Jayden James, receives $15,000 a month in child support and $20,000 in spousal support from Spears.

The spousal support is to end Nov. 15.