Katy Perry's Paramount New Year's Party

Stepping out for hosting duties, Katy Perry was all smiles at the “Gridlock New Year’s Eve” party at Paramount Studios in Los Angeles last night (December 31).

Showing off a sexy look for the evening, Miss Perry arrived to the holiday shindig sporting a provocatively unbuttoned corset dress with patterned black tights.

After posing for lined-up photogs, the 24-year-old "I Kissed A Girl" singer headed into the party to mingle with fellow guests including Seth MacFarlane, Zelda Robinson and Pamela Hasselhoff.

During the course of the night, revelers cheered as they raised a star at midnight, rather than the traditional raising of the ball.

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Enjoy the pictures of Katy Perry out celebrating New Year's Eve in Los Angeles (December 31).