Ho-ho ho-ho ho.
That's the sound of Sienna Miller laughing as she gets her kit off.
The blondesome actress would have you think she's all serious and intense.
But in reality she finds nothing more hil-lar-rious than stripping down to her b'day suit in front of a camera or two.
In a shocking revelation, Sienna told the Daily Express:
"There were eight of us...it was the summer of love.
"We take our clothes off, eight boys and girls, and go for a swim.
"We were nervous but it's real camaraderie when you're all together. It's actually hilarious getting naked in front of people you love and respect."
No, you at the back, Sienna's not a secret orgy fan.
She's actually on about about filming y'see.
And the laugh-a-minute nudey scenes for her new flick Hippie Hippie Shake.
On the topic of that film take, Sienna added:
"The water was freezing cold, so the boys weren't too happy. It was colder than anything I've experienced in my life.
"But as a result it was quite funny and we felt a big sense of achievement after doing it."
These actors, eh? The lengths they'll go to for their art.
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