Khloe Kardashian hosted the 2011 NIVEA Good-Bye Cellulite, Hello Bikini! Challenge at the NIVEA and Shay Todd Summer Chateau last weekend in Bel Air, California. Khloe, who’s hubby Laker Lamar Odum took a back seat to the finals this past season, just threw an amazing engagement party for sister Kim and NBA Nets fiance Kris Humphries. Here’s Khloe with actress Rosario Dawson who attended as well as Paris Hilton, Jaime King, Jason Ritter, Rosario Dawson, Lady Victoria Hervey, Ashley Scott, & Susie Abroimet, and Hope Dworaczyk.