New York reports that Derek Blasberg will ghost-write the new Mary Kate and Ashley book, but we can report something different: That Derek will host Mary Kate and Ashley, plus The MisShapes and the misfits and Ben Cho and Lily Donaldson, at a Paris party this Sunday. The bash is also thrown by Opening Ceremony (the store responsible for Chloe Sevigny's line) and GrandLife NYC (even though we're in Paris). It's at Paris Paris, which is probably one of the most fun places we've danced in the whole world. If you're in Paris, zoom on down. Oh, and Derek's not the only one holding court this week: Today, Alexander McQueen and his posse headline the notorious Don't Tell My Booker bash, which is usually a coke-fueled streak of "Oh my gosh, I can't believe I did that" - albeit, not for the models walking in Lanvin, etc, on the weekend.