Denise Rich threw a fab fashion party at her Fifth Avenue penthouse for daughter Ilona’s sexy, swanky, colorful new spring collection. Ilona’s fans included Sex and the City’s Kim Cattrall, Carol Alt (in one of Ilona’s revealing designs), Russell Simmons, Ivana Trump, Natalie Cole, and the ubiquitous Hilton clan—Kathy and Rick with “It” daughters Paris and Nicky.