It's official -- Ashlee Simpson and Vincent Piazza have gone public.

While the two have already been spotted sharing some PDA on the sidewalks of New York, Ashlee stepped out on the red carpet with her new boyfriend for the first time Thursday night.

The two made their debut as a couple at the Season 2 premiere of "Boardwalk Empire," which Vincent stars on, where she looked adorable with her blonde bob and a purple dress with gold embellishments.

Vincent wasn't the only dapper dude at the event, where Mark Wahlberg, Thomas Jane, Michael Pitt, Steve Buscemi and Jack Huston looked sharp in suits.

Kelly Macdonald, Kelly Calrson and Gretchen Mol and a voluptuous Paz de la Huerta represented for the ladies.

Check out all the red carpet photos above!

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