Last Night's Look: Hit or Miss?

Vote on this week's styles Jessica Simpson, Rihanna and more stars! You decide – are they fashionistas or flops?

Credit: Chris Weeks/WireImage

Updated: Thursday Jul 02, 2009 | 11:15 AM EDT

KOURTNEY KARDASHIAN

The reality star keeps up with the latest trends in a shiny gray minidress draped with gold chains and accented with strappy platforms matched to her exotic Adriana Castro clutch to celebrate her sister Khloe's 25th birthday in Las Vegas.