Meanwhile, a relative newcomer to Hollywood nightlife, Stephanie Pratt, impressed in a fun denim dress. While she seemed to enjoy herself at the party, "The Hills" hottie had a rough night on her MTV show, as she faced confrontations with Kristin Cavallari and her big bro Spencer. John Shearer/WireImage.com - May 4, 2010
Celebs 'Heart' Ronson
Paris Hilton, Nicole Richie, and more mingle at the JCPenney Spring Cocktail Jam in LA.