KEVIN FEDERLINE WANTS BRITNEY SPEARS TO GO INTO REHAB OR ELSE !

Kevin Federline has begged estranged wife Britney Spears to go into rehab, it has been reported.The wannabe rapper - who split from Britney last November after two years of marriage - has been trying to persuade the singer to clean up her life and threatened to take their two sons away from her. A source told America's Star magazine: "Kevin has tried to convince Britney to check herself into rehab from every possible angle. First he tried threatening to take away the kids, and then he tried pleading with her to take care of herself."Kevin, 28, has even joined forces with Britney's mother Lynne in a last-ditch attempt to convince Britney to be a better mother to 16-month-old Sean Preston and four-month-old Jayden James.The source added: "Kevin is afraid that Britney is going to hurt herself."Britney isn't spending enough time with the kids. They are being raised by strangers. He has told Britney to get help before it's too late."Meanwhile, Britney, 25, has ended her relationship with Isaac Cohen.The 'Toxic' singer, who began dating the Los Angeles model just two weeks ago, announced they are no longer a couple.When questioned about her romance, Britney said: "We're not together anymore, by the way."