Nicky Hilton dressed up in a very chic blue 1920-inspired outfit and put on her dance shoes to celebrate her birthday in las Vegas this weekend. Nicky wore a natural make-up look and straight hair while her big sister Paris Hilton wore a pink two layered dress with black lace and went for a more intense make-up with red lips and curly locks. Which of the Hilton sisters do you think had the best party look? I'd love to hear your expert opinion!