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.

To see lots more photos including Kelly Osbourne, Jon Hamm and many others just read more.

Images include: Annie Wersching, Brittny Gastineau, Cheryl Burke, Cris Judd, Doug Reinhardt, Eliza Dushku, Fergie, Jennifer Westfeldt, Jon Hamm, Jordana Brewster, Kara DioGuardi, Karina Smirnoff, Kelly Osbourne, Kourtney Kardashian, Lauren Conrad, Martina McBride, Paris Hilton, Rachael Leigh Cook, Shanna Moakler, Taraji P. Henson, Tila Tequila, Estelle, Garcelle Beauvais, Khloe Kardashian, Holly Madison

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