HBO gathered the stars of Boardwalk Empire last night at NYC's Zeigfeld Theater to celebrate the show's second season, which debuts on the network Sept. 25. Leading man Steve Buscemi had the company of his wife, Jo Andres, while Michael Pitt had his model girlfriend, Jamie Bochert, and Vincent Piazza made his red carpet debut with Ashlee Simpson. Ashlee and Vincent also showed PDA recently at a fashion week bash, when they went out to celebrate Christina Ricci's Nylon cover. Other stars from the series like Kelly Macdonald, Jack Huston, and Gretchen Mol mingled with producers Mark Wahlberg and Martin Scorsese. The gang moved their festivities over to the Waldorf Astoria for the afterparty, where Jack met up with his aunt, Anjelica Huston, and Kelly gave her pal Emily Mortimer a big hug. The premiere of Boardwalk Empire is much anticipated, especially after the series just won seven creative Emmys last weekend.