Gwen Stefani and Gavin Rossdale dressed as blood-sucking vampires! Nicole Richie as Cruella de Vil! Jessica Alba as Slash! Paris Hilton as a sexy angel! It's either the wildest dream of all time -- or Kate Hudson's epic Halloween bash!

Last night, Hollywood's hottest and music's biggest names all got gussied up for Hudson's over-the-top costume party in Los Angeles. And we were not disappointed by the outrageous costumes! The celebs in attendance seemed to go gaga for the festive bash, getting all decked out in head-to-toe Halloween finery. We love that Gavin and Gwen really took a bite outta playing dress up!

The other celebs who put on the ritz for the How To Lose A Guy In 10 Days actress' bash include Dianna Agron, Lea Michele, Chris Martin Adam Sandler and more! Check out all the celebs who got spooky and sexy -- and a few who didn't -- we're looking at you Tobey Maguire and Orlando Bloom!