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Sienna Miller and Rachel Nicholls tell Newsbeat about new film GI Joe, what it's like to work together and plans for the future.

You had to wear leather trousers for GI Joe, so how was it?

Sienna: The leather was not so comfortable - but it looks cool. It doesn't dry overnight, so at 5am when it's still dark, squeezing yourself into wet leather is not very pleasant. But there was talcum powder, there were ladies on hand to assist! It was a case of lying down flat and wriggling into it.. there was lots of jumping and squirming, it was a bit of an effort.

Rachel: It took about 15 minutes to get out if you needed a wee break! We had to do co-ordinated group cast loo breaks - the GI battle gear was also laborious to get into.

Did you like the result?

Sienna: I was quite excited - I actually looked hardcore for once and that's an achievement. They are great characters, femme fatales.

Rachel: You forget the bad parts when you see how absolutely cool you look.

What was filming together like?

Sienna: We needed each other - it was a very testosterone-fuelled environment - we actually spent Valentine's day together, in my bed!

Rachel: We all got on so well making the film - we spent all of our time together - they are really good boys.

Is it nice for you two to team up?

Rachel: Yes, it's really nice doing interviews together, it gets tedious and you get sick of your own voice, it's nice to have someone to defer to.

Sienna: We get the giggles, we have fun.

Sienna, we saw you on Top Gear...

Sienna: I love Top Gear - I got 1.49 - I was shaking like a leaf but I am so competitive. I actually spun the car, I don't think they showed it, but it was pretty scary. It's such a great show I was really thrilled to be on it.

So what's next?

Sienna: I'm going to be in New York for Broadway - I'm very excited, it's like a British invasion, it's going to be great. It's with Johnny Lee Miller - who is a friend of mine. It's a Patrick Marber play called After Miss Julie, it's a really heavy, cool drama - the antithesis of GI Joe, but equally fun and exciting.