Sienna Miller is happy

She told Elle: "The big, big thing I've discovered, the big secret, is that it's all about how happy you are. It's the ultimate thing.

"People forget your flaws and imperfections if they see you're happy. And I'm incredibly happy right now. Probably happier than I've ever been."

She said she had enjoyed having a "big moan" with co-star Keira Knightley while shooting the movie, saying: "From the outside, it seems like we have great lives but there are pressures, such as lack of time, being chased by the paparazzi and being criticized all the time.

"We'd sit there and moan to each other and then after a few hours I'd burst out laughing because, ultimately, we both love our jobs and are incredibly privileged to have these lives."

She added: "It's such a relief to have a big moan. We were like two old fishwives."

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