Sienna Miller is now "immune to bitchy criticism"

She told The Guardian: "Nowadays I feel relatively immune to that kind of bitchy criticism. I don't feel like I am interesting enough now to be focused on in the way that I was. I don't want to go out to a pub every night and get p****d. I don't want that drama."

Sienna has a four-year-old daughter Marlowe, with her former partner Tom Sturridge, 31, and although the pair split two years ago, she says they are closer than ever.

Sienna called Tom "absolutely my best friend" and added: "we're often together at weekends, and he's there now with his mum and her in my place. It's all frustratingly amicable from an outsider's point of view, but really blissful to be in."

And Sienna would love to have more children.

She said: "I'd like an army of them. You can't change who you are. I'll always be the same person. I just grew up a little bit, got pregnant and had a kid."

Meanwhile, Sienna also admitted that she doesn't have as much confidence about her acting ability as she had when she was younger, claiming it has been "whittled away".

She said: "I think, from a really young age, I had a real confidence. I had no doubt in my mind that's what I would do. I wanted to be, like, in my own mind I was like Meryl Streep. I hadn't given it much thought, like most things, but it's like, that was my job, that's what I wanted to do, and there was never any doubt in my mind.

“It's actually a really interesting lesson in how much your own confidence and belief can influence things. You see it with Donald Trump. Not that I was like him. I mean, obviously, that's a really sinister example. But you can absolutely manipulate the situation if you do not allow for doubt within it. I went into every audition believing that I could get this, and there was something about that confidence – people were like: ‘Oh!' – that I think was disarming.

"It's whittled away. I think life just sort of happened in quite a full-on way, and I just learned through experience to just become … you know, I just lost some of that innocence and positivity, which is growing up, which is getting older, which happens.

"I'm just more realistic now. It used to be that everyone was lovely and everything was great and I was so positive and I just couldn't wait to live and experience. Now, I'm a bit older, and a bit more tired all the time."