Sienna Miller thinks there is "no point" buying designer clothes for her everyday life

She told Grazia magazine: "I wear a lot of high-street clothes because I'm fickle and impatient - I get bored quickly and you can find amazing pieces.

"I have a 12 year old, so I'm always in Urban Outfitters these days.

"I like to buy expensive knitwear and designer shoes. And for work, I get to wear glamorous things, but day-to-day there's no point spending a lot of money when you can get something beautifully made on the high street."

Sienna has just released a second collection for Marks and Spencer and she's had a great time working on the collaboration.

She said: "I have been in a baby bubble for a year, so that's been the headline.

"But all of this has been a bonus...

"Designing this collection has been amazing and so much more fun than I thought it would be."

The 'Factory Girl' star previously dec lared her top style tip is to make sure you have a "great pair of jeans" because they can "elevate" any outfit.

She told Stylist magazine: "I have quite a clear aesthetic of what works for me. I think a great pair of jeans, shoes will elevate any outfit, a great jumper. "I tend to wear a lot of jeans, and then earrings and accessories or a nice watch."

Sienna added she has quite an extensive collection of knitwear and she loves one particular jumper - from high street store Reiss - and her daughter often borrows it.

She explained: "I like to buy knitwear. I have a great jumper from Reiss (a crew-neck mid-grey cashmere jumper) - you'd never know it wasn't The Row. It's a perfect jumper. My daughter nicked it and looked amazing in it."