SINGER Britney Spears has splashed out on a £2.5million beachside lovenest in Malibu. And she is set to marry Kevin Federline, 26, in the back garden next month — three months early. The couple have already earmarked a nursery for a baby they want next year, and a bedroom for Kevin’s two kids. Britney, 22, decided to hold her £1million wedding there after plans for a hotel do in November leaked out. Guests will be given two weeks’ notice.