Despite her cruel comment, Britney also allegedly gave Kevin one last chance to save their marriage, as they finalized their divorce settlement last month.

A source told Star magazine: "Britney said, 'Do you really want to do this?' and Kevin said yes. Britney replied, 'You're the biggest mistake I've ever made, but thank you for my babies.' "

It is also claimed Kevin, 29, led Britney, 25, to believe they would get back together after she left rehab to ensure she finished her treatment at Malibu's Promises center.

Meanwhile, Britney is said to have found love with musician Howie Day, who she met at Promises.

A source told Life and Style Weekly magazine: "Britney has fallen hard for him.

"Britney just lights up and seems back to her old self when she talks to Howie or tells people about him. She thinks he's very talented - and says he's the best kisser ever!"

The Toxic singer is so smitten she is planning to take Howie to her cousin Erin's wedding in June.

However, Britney's mother Lynne is less than pleased with her daughter's new love and thinks he will be a bad influence.

The source added: "Lynne wants Britney to be with someone outside the music industry. Howie is always on the road and exposed to influences that are discouraged in rehab."