One of the Things Sienna Miller is Most Afraid of is Her "Big Mouth"

I m doing my Vogue pose, I ve been doing this for days!

♫ Rock Music ♫

Today we are here, just outside of Palmdale

in California, and we re shooting the cover of Vogue.

It s a kind of asymmetrical dress and leggings story.

With very scraped back hair.

For the next six months I am going on a world tour

with G.I. Joe, this movie that I have coming out.

All over to places I ve never been -

Korea, Japan, Australia, Russia.

I mean, we re hopping around like mad before I go to

New York on the 28th of August to start rehearsals

for my play.

I m very excited about coming to Broadway,

I m terrified and excited.

And I keep saying to people like, Broadway!,

and doing jazz hands and then realizing that actually

I kill myself at the end of the play.

So it s not really like a perky musical.

(♫ Rock Music ♫)

My personal style is a little bit more sophisticated

than it used to be, I think,

because I m growing older.

I kind of like not looking too put together

but with a bit of structure,

and nice and tailored, fitted clothes,

but with something that s a little more shabby.

I m not too super glamorous, I think I m,

I might get there soon.

(♫ Rock Music ♫)

[ Track that picture, you do it well ]

I m scared of my big mouth.

I m fearful of letting people down, or making mistakes.

But on the whole I m quite fearless, I think.

Which sometimes gets me into trouble.

I feel like I m in a pretty good place now.

And in ten years, I d love to still be working,

I d love to still be doing shoots with Vogue.

I d love to have kids, probably.

But I m not really like a forward planner.

I m more spontaneous as a person.

So I try not to look too far back, or too far forward.