Gerard Butler & Jessica Chastain: 'Killer Joe' Party!

Gerard Butler and his Coriolanus co-star Jessica Chastain attend the Killer Joe party at the Toronto International Film Festival on Sunday (September 11) at vitaminwater Rooftop in Toronto, Canada.

The two actors attended the CAA- and vitaminwater-sponsored bash, which celebrated Emile Hirsch‘s new comedy-drama.

Also at the event: Colin Farrell, who met up with Dave Matthews, James Franco, and Juno Temple.

The next day, Gerard and Jessica promoted Coriolanus at a press conference during the film festival.

The two were joined by co-star Ralph Fiennes and Brian Cox.

FYI: Jessica paired vintage YSL from Decades burgundy dress with Jimmy Choo shoes.