The actor was supported by co-star, Sopranos actor James Gandolfini, music star Kanye West, and several glam ladies including Victoria's Secret Angels Doutzen Kroes and Anne V. Angelina Jolie wasn't in attendance.
The thriller, which hits cinemas on November 30, is really meant to take a more serious look at American politics, says Brad.
"We're at a particularly ugly time when we're at such a divide in America, but that divide is not there because everyone is trying to figure out what’s best for the people," he told Guy Ritchie in Interview magazine. "It's there because one side is trying to win out over the other side."
Brad had jetted in from Britain, where he and his family have been based for the past few months. And the star has been so busy with his new film there, he almost forgot about a very important US holiday.
"I didn't know it was Thanksgiving until like midday. Until [the] afternoon," he said. "When you're overseas, they don't celebrate it in England. And [Angelina] and some of the kids are overseas in Cambodia this week, working on the [The Maddox Jolie-Pitt Foundation] there. It completely escaped me until someone brought me some English pumpkin pie."
The star hit headlines in the UK when he 'accidentally' helped raise funds for a baby unit at a Southampton hospital. The star was filming scenes for his zombie flick in the village of Lulworth, Dorset, when he realized a local lady, Karley Gallagher was holding a fund-raiser for Southampton General 's neo-natal baby unit.
The Hollywood star's security team were approached by a local shop owner, who was worried the star's presence in the town would distract attention away from the charity day. Later the men came back with an envelope containing £ 700 and signed postcards of the actor to help the cause.
"I was grinning from ear to ear… What he did for us was incredible," said Karley, whose son Zachary was treated by the baby unit when he was born at 36 weeks with a life-threatening hernia. The little boy's middle name is Benjamin, after the main character in Brad's film The Curious Case of Benjamin Button.