Britney Spears is going out of her way to give husband KEVIN FEDERLINE's hip-hop career one last-ditch boost by agreeing to be the guest of honour at an upcoming Las Vegas, Nevada party. The pop star will attend the Federline album listening party at nightclub Pure tomorrow night (21APR06) - and she's inviting a posse of pals to join her. An event insider tells entertainment news website, "It's a public statement of support for Kevin's fledgling career."