Nicole Richie and Kate Bosworth hosted a bash in LA last night celebrating their pal Derek Blasberg's new book, Classy: Exceptional Advice for the Extremely Modern Lady. Derek's currently in the midst of a cross-country book tour that included a stop San Francisco, where he shared five fashion no-nos with Fab. Nicole was with Joel and their daughter, Harlow, earlier in the day, but her date for the evening was her soon-to-be brother-in-law Benji. Nicky Hilton, though, was the one subjected to Nicole's sense of humor while they posed for a photo. The evening was all about starlets, fashion, and Derek, but the party also interestingly brought out the apparently reconciled couple Balthazar and Rosetta Getty.
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