Paul Bruinooge/Patrick McMullan/Sipa
02/28/2013 at 06:00 AM EST
After the premiere of his new film Dead Man Down
on Tuesday, Colin Farrell
joined his castmates and friends at Lexington Social House in Hollywood.
Dressed in a Dolce & Gabbana suit, Farrell mingled with the cast and moviegoers for two hours.
"They complimented him on his performance," an onlooker tells PEOPLE. "He was in great spirits."
The actor sipped on diet soda as he kicked back and lounged around the outdoor fire pit.
The movie – a crime drama set in New York City – also stars Terence Howard, Noomi Rapace and Dominic Cooper.
– Jennifer Garcia