Kim Kardashian and Khloé Kardashian have stepped in to support Britney Spears as she navigates the disturbing allegations made by ex-husband Kevin Federline in his explosive memoir. According to a new report from RadarOnline.com, Britney has "been thrown a lifeline" by the Kardashian sisters just days before her 44th birthday on Tuesday, December 2. The trio reportedly reconnected during a surprise pajama party arranged by Britney's longtime manager, Cade Hudson. A source shared that the reunion helped break the ice and lift the singer's spirits. "Kim and Khloé are very close friends with Cade, who made this get-together happen," the insider revealed. "They all snuggled up in bed together and watched an episode of Kim's new show, All's Fair. There was a lot of laughter and goofing around, with no judgment." The insider added that t...