Brit Brit isn't a bank!

Britney Spears is pissed that her ex Kevin Federline is requesting more child support, Us Weekly reports.

The backup dancer is asking for an increase in the $20K monthly payments he receives "to recognize the sacrifices he’s made. He could have threatened to cut off access to the kids, but has not," a source told the mag. Federline was granted full custody of their two sons Sean and Jayden after the pop star's breakdown and subsequent conservatorship in 2007.

"She’s angry Kevin is asking for more money because she pays for everything. Those boys are her world. She is an amazing mother. Yes, she has her career. But her job as their mom is the most important role in her life," the insider revealed.

The aspiring DJ thinks his ex is thriving due to his parenting support.

"Kevin has always allowed for very liberal visitation. He has been supportive of her recovery. Kevin thinks her success is in part because the boys have been in her life," the source added.

The singer feels like she's footing the bill for his four other kids as well, and she's not happy about it. Her dad Jamie, who acts as her conservator, has promised his daughter he'll work it out for her.

"Britney feels as if she is paying for them also. His rapping and DJ’ing don’t pay the bills. Jamie isn’t going to meet an outrageous demand. He knows how important the kids are to Britney and won’t allow her to lose them. Jamie has assured her this won’t become an issue," the insider explained.

Time for K-Fed to get a job!