The pregnant singer has told pals that if he doesn't stop his cruel taunts she'll have no choice but to end their marriage.

"Britney is sick and tired of all the abuse that Kevin slings her way on a daily basis and she's finally told him to knock it off or their reconciliation is going to be short lived," says a source.

Pals say although Britney was ready to divorce Kev months ago, she decided to give him yet another chance so their 10-month-old son Sean Preston and unborn child would have a united family

Meanwhile National Enquirer reports , Britney Spears and Kevin Federline plan to renew their wedding vows next month during a romantic Hawaiian ceremony, to show the world everything's fine with their scary-tale marriage

"It's all Brit's idea. She's convinced herself that their marriage is strong and wants to show she's fallen in love with Kevin all over again," a family friend told The ENQUIRER.

"So she wants to have a big, splashy ceremony with all their family and friends and the baby in attendance."