Who would’ve thought one of the skinniest celebrities in Britain actually wants a fuller figure? With the plus-size debate continuing not only in the United States’ magazine circles, but also across the pond in the United Kingdom, Sienna Miller is one of the latest celebrities to endorse the plus-size model.

The former model-turned actress told New York magazine that she thinks plus-sized women are more beautiful than their “poker-thin” sisters.

“I really do,” she was quoted as saying. “I would love to have boobs to go with my hips, but I don’t – that’s just not the way the cookie crumbled.”

The 27-year-old beauty was responding to a question about glossy fashion magazine, V Magazine, debuting plus-size models in their January 2010 issue. The magazine is taking a stand and the next step into the future, proving that been skinny isn’t as glamorous (or realistically in touch with readers) as it once was.

Speaking about her own body issues, when she was still modeling, Sienna said she could’ve sworn she was only hired for shows to make the other models feel better about themselves.

“I was, like, the short, funny one that they booked to make the other girls laugh and to make them look taller.”

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For Sienna Miller’s role as The Baroness in the new movie G.I. Joe: The Rise of Cobra she had to be be fit for all of those martial arts scenes and obviously svelte to fit into that incredible black cat suit.  (See photo above)  Her personal trainer, Marcus Young shared some of her secrets on how he went about preparing her for this demanding role.  He normally advises his clients to have exercise-free days in order to give the body time to recuperate.  He said,

“Work hard but listen to your body. I’m an extremist so I push as hard as I can until my body says, ‘Hey it’s time for you to take a day off.’  For best results, cross train – alternate martial-arts sessions with biking, for example. It’s important not to get bored.”

In Sienna’s case they had to follow a rigorous schedule and those days off were few and far between.  Young explained,

“We had to get in as much as we could, as once filming began we could only squeeze in an hour a day.  We called it Fight Club. After her first session she could barely walk – she’d used muscles she’d never used before.”

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