Photos of Lauren Conrad, Paris Hilton, Doug Reinhardt, Fergie, Kara DioGuardi at Hot Hollywood Party in LA

It was a star-studded red carpet at Us Weekly's Hot Hollywood party in LA last night. Lauren Conrad is a staple at the yearly bash and looked angelic in white after spicing it up in yellow to give out spoilers at PaleyFest. Her ex Doug Reinhardt was there, attached at the hip with Paris Hilton as usual, though we'd rather gaze at Jon Hamm with Jennifer Westfeldt by his side. Even Kara DioGuardi stopped by after American Idol's double elimination night. Never ones to miss an event, Khloe and Kourtney Kardashian, back from their bikini trip to Mexico, made it out for the festivities as the gorgeous crowd partied the night away.