Filming romantic scenes with Kate Winslet while being directed by her husband felt as comfortable as if they were family, Leonardo DiCaprio said.
DiCaprio plays Winslet's husband in Revolutionary Road, the new film directed by Winslet's real-life husband Sam Mendes.
Speaking at its European premiere in London, he said: "I was very comfortable with the situation. It felt like a kind of a family -- a sort of weird twisted family."
Describing what it was like to kiss his "best friend'', DiCaprio said: "I was entirely too used to that from doing that film [Titanic] with her, so to me it was very natural.'' He said Winslet has not changed since the two starred in James Cameron's epic 12 years ago.
"She is one of the most real people I have ever met,'' he said at the premiere at London's Leicester Square Odeon.
"She's been such a great friend and we've been support mechanisms for each other for a long period of time now.''
But professionally the two have grown up, he added.
"We're no longer young 20-year-olds looking up to directors and parental figures. We're now adults who are taking command of our careers in a different way.'' Winslet, who attended the premiere wearing a revealing black Narciso Rodriguez dress, laughed off questions about her embarrassing Golden Globes acceptance speech.
"I just did not expect to win both of those awards and I've never won before so you can't imagine how overwhelming that moment is,'' she said.
She denied having prepared any acceptance speech.
Winslet reciprocated DiCaprio's warm sentiment describing him as "the greatest actor of his generation''.
Revolutionary Road, adapted from a novel by Richard Yates, tells the story of an American couple in the 1950s who decide to escape suburbia and head to Paris.