The pregnant singer heads to a Malibu ranch with her stepdaughter. Plus: Jessica Simpson, Jennifer Lopez and more

BIRTHDAY GIRL

Cowgirl Kori Federline mosies along with stepmom Britney Spears during the 3-year-old's party at the Bony Pony Ranch in Malibu on Sunday. Dad Kevin Federline and friends joined in on the fun, too.



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