Britney Spears crying over Kevin Federline's 50 million demand.

According to Life & Style Magazine the only way Britney Spears can guarantee she'll keep custody of her sons, Sean Preston, 16 months, and Jayden James, 4 months, is to give in to Kevin Federline's settlement demands.

Brit’s estranged hubby turned down a $10 million offer in December and is now asking for an astonishing $50 million- about one third of Brit’s net worth - to give up full custody of the kids.

“She’s been crying practically nonstop,� says a friend of Brit’s.

If Spears holds out a little longer, she may get out for cheap, Sfgate is reporting thatKevin Federline is on such a tight budget since he broke up with the pop star, he tried to return some clothing she bought for him and collect the cash.

In late December, the former back-up dancer tried to return nearly $15,000 worth of pricey Libertine and Mastermind Japan clothes that Spears purchased for him.

According to In Touch magazine, Federline returned the items at exclusive Los Angeles store Maxfield, which included a jacket that cost $1,620.

The 28-year-old wanted a cash refund for the merchandise, which still had the original tags, but when the clerk refused, he settled on a store credit.

A source explains, "He was looking for pocket money. Now he's going to try to sell the credit."