The film marks Schwarzenegger's first major acting role since he said 'hasta la vista' to the world of politics and stepped down as Governor of California in 2010. Joining the politician action star was Sylvester Stallone, Jean Clauude Van Damme, and British actor Jason Statham.
Stars from the sporting world were there too as Usain bolt and medal winners from Team USA walked the red carpet.
The Expendables 2, directed by Simon West, sees Barney (Stallone) lead his team of mercenaries on a mission which goes terribly wrong when Van Damme's villainous character takes them by surprise.
The film, is released in cinemas across the UK from Thursday, and is the sequel to Box office hit The Expendables.