HILTON CHECK-IN: Kathy Hilton hosted a cocktail party at her Bel-Air home Wednesday night to toast the first season of her dress line, designed and marketed in collaboration with Mon Cheri. “I think there’s a niche for detail without spending a fortune. Women don’t want to throw money away on dresses in this economy,” she said of the Kathy Hilton Collection, which ranges from $325 retail for short cocktail dresses to $750 for gowns, and sells in Saks Fifth Avenue, Neiman Marcus and Nordstrom. Some dresses sport names like Dinner at Grenouille, and others were inspired by rooms in her house. For fall, Hilton is adding dyed-to-match shawls for $40.