One year before Kevin Federline was sued over a six-figure credit card bill, he admitted to blowing through his ex-wife Britney Spears’ child support money “almost as soon as it came in.”

The former rapper received $20,000 every month for their two sons after he and the pop star divorced in 2007.

The hefty number reportedly doubled to $40,000 a decade later when Federline’s custodial time increased, then dropped back down when their eldest turned 18 in 2023.

Federline confessed in his “You Thought You Knew” memoir that “the money was gone almost” immediately and “didn’t stretch as far as” one would think.

The 48-year-old explained in the October 2025 tell-all that the security Sean Preston, 21, and Jayden, 20, “needed” while living in Los Angeles “came with a price tag that would make anyone’s head spin.”

Additionally, Federline noted that trying to give the boys the lavish “lifestyle” they were “used to” brought them “easily” over the monthly five-figure sum.

“It added up fast,” he wrote. “People hear figures like that and think you’re financially set. But the reality is far from that.”

Insisting he never “coasted” off of Spears’ money, Federline denied being “some bum just sitting around waiting for a check.”

The former backup dancer, who is also the father of two kids each with ex Shar Jackson and wife Victoria Prince, wrote, “I was out there hustling, grinding, investing — working to build a solid foundation for myself and my kids.”

Federline stopped receiving payments from the Princess of Pop in November 2024 — and, Page Six hears, he signed an agreement with City National Bank that same month.

According to court documents obtained by Page Six Thursday, he now owes the bank at least $117,704 spanning a credit card, a line of credit and an overdraft line.

Federline is being sued — not just for the amount owed but interest as well, which is 20.5 percent on the credit card, 7.5 percent on the line of credit and 18 percent on the overdraft line.

He, per the lawsuit, had until August 2026 to pay off the credit card, while his personal overdraft line and personal line of credit and were due in April and June 2025, respectively.

On top of that, Page Six reported Friday that Bank of America was suing Federline in February for $12,186.64.

However, the bank filed to dismiss the lawsuit with prejudice in June, showing Federline paid the amount owed.

Federline’s attorney has yet to respond to Page Six’s request for comment.