Britney Spears allegedly left a restaurant without paying.

The 32-year-old singer and her boyfriend David Lucado reportedly walked out of The Cheesecake Factory in Thousand Oaks, California, and forgot to settle their bill after gorging on a delicious lunch.

However, a friend of the 'Till the World Ends' hitmaker insists the blonde beauty simply made a mistake and feels ''horrible'' about it, according to

The loved-up couple - who started dating in March 2013 - enjoyed an appetizer and a salad before telling the waitress that her bodyguard would pay the $30 debt and leaving with a doggie bag full of leftovers.

However, her bodyguard failed to settle the tab as he believed Britney had already paid for the meal.

Meanwhile Britney - who has sons Sean, eight, and Jayden, seven, with her ex-husband Kevin Federline - is planning to start a family with David when her Las Vegas residency ends next year.

A source said previously: ''Britney cannot wait until the Vegas show is done because she wants to start a family with David. She says she will get pregnant as soon as the show is finished!

''David is always with her in Vegas and they act like an old married couple together. He is really good with her kids and has taken to the father role pretty easily.''