Back of Nicole Richie and Kate Bosworth Try Their Best to Keep Things Classy For Derek Blasberg 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. View 30 Photos › Photo 1 Photo 2 Photo 3 Photo 4 Photo 5 To see more from Derek's party just . View 30 Photos › Photo 1 Photo 2 Photo 3 Photo 4 Photo 5 Photo 6 Photo 7 Photo 8 Photo 9 Photo 10 Photo 11 Photo 12 Photo 13 Photo 14 Photo 15 Photo 16 Photo 17 Photo 18 Photo 19 Photo 20 Photo 21 Photo 22 Photo 23 Photo 24 Photo 25 Photo 26 Photo 27 Photo 28 Photo 29 Photo 30 Images include: Kate Bosworth, Nicole Richie, Mischa Barton, Nicky Hilton, Benji Madden, Patricia Arquette, Charlotte Ronson, Balthazar Getty, Brent Bolthouse, Margherita Missoni, Derek Blasberg, Liz Goldwyn, Dasha Zhukova, Rosetta Getty Image Source: WireImage Comments Louie 7 years And Mischa. Man. That hair? Does she pay to have it made look that bad? What's with the colour? She looks sad in the photos. Especially in the one of her from the waist up. Louie 7 years Funny, I was going to comment on Nicole's style as well. I think she's taken the boho-hippie thing as far as it can go. Something new now, please. Personally, I think Kate is too skinny (she looked amazing in Blue Crush) but I love her style. naziazholesusuck 7 years really dont like nicoles dress. runningesq 7 years I agree with what was said about Nicole Richie's style.. I'm not a fan of boho-chic anyhow, but she just looks like a wanna-be hippie. missmegs825 7 years Kate Bosworth looks great! She has great legs. Im not sure why everyone always says she's too thin..how can you call her skin n' bones (above) when she's standing next to Nicole Richie? There is such thing as being naturally thin.. jaan_black 7 years love Nicole's style, she sticks with what she likes...I like skin n bones'(Bosworth) outfit, just not on her babaloo 7 years Not digging Richie's hippy look. Boho-style is annoying. Kitty-Collins 7 years i would like to see Nicloe move away from the boho look. not abandon, just more variety, she has such a wonderful shape. skigurl 7 years nicole is too cute but she shouldn't wear stuff like that to formal events...that's too casual and too hippy. i wish she would save that for lunches out during the week and turn the style-meter up when it comes to classy events.