According to celebrity tattle-tales, Kevin Federline is not very happy about all of those flicks of his soon-to-be/reportedly reuniting ex-wife trooping all over the tropical sands of Hawaii with sons Sean Preston and Jayden James in tow. Kev claims Brit violated their court-ordered custody agreement when she left the State of California with the boys without notifying him or taking a nanny along for the trip. The Rapper Formerly Known As K-Fed is vowing to take Britney back to court and fight for full custody!

A National Enquirer snitch dishes that: “For two days Kevin was desperate to find his children.”

The Enquirer article claims:

Kevin, worried over Brit’s drinking drug use, and wild behavior, had refused to give his OK to the Hawaii trip. Kevin bombarded her with phone calls, but she refused to answer. When Kevin checked the hotel Britney has used on previous Hawaiian vacations, she wasn’t there. According to an insider, when Britney finally answered her cell phone she infuriated Kevin even more when she told him she was indeed in Hawaii, sitting poolside sipping a drink. Kevin could barely control his temper. He issued an ultimatum: Get on a plane with the kids by noon on June 8 and head back to L.A.

….Kevin is determined to gain full custody of his children by going back to court to argue that Brit is an unfit mother, with the trip to Hawaii just the most recent incident in the loopy behavior that she’s been displaying.

“Kevin is upset that Britney’s partying hasn’t stopped. She’s drinking heavily, and Kevin believes she’s also doing drugs,” the mole went on. “He urged Britney to surrender the kids to him permanently, but she said: ‘No way!’ But based on Britney’s boozing alone, Kevin believes he’ll be awarded full custody when he takes her to court.”

“He’s not waiting any longer. He feels he gave Britney plenty of room to show she could be a good mother. Now he feels she can’t be trusted and he’s going back to court right away to try to get full custody.” Kevin says, “If the court awards full custody to him and Britney loses her children, she’ll have no one to blame but herself.”