Sherlock Holmes director Guy Ritchie turned out to support friend Robert Downey Jr at the premiere of his new film Due Date.
The Oscar nominee said he felt like he was "coming home" and an "honorary Brit" in returning to London for the event at the Empire in Leicester Square, as he has spent a lot of time in London filming Sherlock Holmes and is currently filming Sherlock Holmes 2 with Guy.
In Due Date, directed by The Hangover's Todd Phillips, Robert plays uptight architect Peter, forced to hitch a lift across America with eccentric aspiring actor Ethan, played by The Hangover star Zach Galifianakis, in order to get home in time for the birth of his first child.
Robert said he was attracted to the film because it reminded him of some of his favourite road movies, a genre he had not tackled before.
"The story reminded me of Rain Man and Midnight Run and Trains, Planes And Automobiles, the kind of movies I loved growing up," he said.
"I hadn't really done anything like that before and I thought it might be nice."
But the 45-year-old actor, who attended the premiere with his producer wife Susan Downey, insisted the film brings something new to the genre.
He said: "It has a different frequency and a different take, because honestly I'm really fortunate at this point in my career that I'm not just going to be derivative. And I think that's why Iron Man kind of worked out well, because we did something a little bit different with that genre.
"So we like playing the genres and we like, not trying to improve on them, but just trying to take them in slightly different directions."