“Boardwalk Empire” stars Steve Buscemi and Gretchen Mol celebrated cast mate Michael Kenneth Williams’ birthday at Lafayette Grand Café & Bakery on Friday night. The show’s executive producer Terence Winter presented the actor with an engraved bottle of Johnnie Walker Blue Label, while Buscemi, Mol and other cast members including Annie Parisse toasted the success of another season of the HBO hit with — perhaps appropriately — Tanqueray and Bulleit Bourbon cocktails. Also there: Paul Sparks, Margot Bingham and Rachel Winter.