Britney Spears Credit Card Caper

1/19/2010 12:20 PM PST

Britney Spears Credit Card Caper

Britney Spears may not be capable of signing record deals and buying homes, but when it comes to a simple shoe purchase, she's a regular shopping ninja.

We've learned Britney is using her bodyguard's credit card to score purchases that don't fit into her conservatorship budget.

Britney hit up the Steve Madden store in the Valley over the weekend and bought 2 pairs of boots. We're told Brit paid for the new kicks with a credit card, but the card had the name of one of her bodyguards on it.

The store employees gave Britney a hard time over the card ... because she signed her own name on the dotted line. We're told Britney convinced the clerk the person named on the card is an employee of her company and she was entitled to use it.

Here's the thing: Under the terms of the conservatorship Britney has a credit card with a limit of $1,500 a week.