Last night, another party honored the hottest of Hollywood -- and everyone from David Arquette and a crazy-haired Ke$ha to Paris Hilton and a ring-flashing Karina Smirnoff were there!

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Us Weekly's Hot Hollywood party was the place to be seen, and we've got some dirt from inside the bash!

Newly single David Arquette was seen dancing "wildly" with a random blonde woman all night. He was clearly having a great time, flailing his arms, drinking and having no care in the world! He was also spotted hanging out with business partner Jeff Beacher.

Paris Hilton showed up with her sister Nicky and Nicky's BF David Katzenberg and, once inside, the trio sat atop a banquette with their entourage, just hanging out. Paris, being Paris, even stood up on the banquette to dance for a little bit.

The Situation, who attended another event earlier in the night with Brittny Gastineau, showed up as well -- but kept it low-key, smoking cigarettes, drinking and jumping up on the banquette a few times to dance. He also appeared to get annoyed when a group of female party-goers tried to take pics with him.

A couple engagement rings made appearances at the bash too -- with "The Bachelorette" stars Ali Fedotowsky and Roberto Martinez briefly showing up and Karina Smirnoff flashing her new bling on the red carpet.

Check out all the party pics!

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