milk studios charlotte ronson blonde Paris Hilton

Last night Paris Hilton, wearing French Connection, and her sister Nicky (along with a slew of other stars including Nicole Richie, Mischa Barton, Samantha Ronson and Stephanie Pratt) attended the Charlotte Ronson and JC Penney Spring Cocktail Jam at Milk Studios in Hollywood. Paris rocked a sexy striped number and Nicky opted for basic black, and the girls looked like they were having a blast when we spotted them leaving the event.