Sienna Miller is too busy to go shopping.

The 33-year-old actress has a three-year-old daughter Marlowe with her ex Tom Sturridge and while she loves being a mother, Sienna admitted that combining a busy career with raising her child means the style icon has little time to worry about what to wear.

She told the new issue of Britain's Vogue magazine: ''I don't remember the last time I went shopping. I swear to God, I wear jeans and trainers and a T-shirt most days.''

Sienna also revealed that she never has a moment to herself and often feels guilty as she tries to ensure she is a good mother to Marlowe, while also working hard in her career.

She said: ''Obviously when you have a baby it's the most incredible experience but your life is also catapulted into this chaos and you are exhausted.

''I could literally get on this table and fall asleep. I'd like to be better at managing things; I'd like to be more super - although we're never going to feel it, even if we are.

''That's the curse of motherhood - we just run ourselves ragged. I'm just trying to get a sense of what that guilt is. I sometimes feel like it's a totally invented emotion. It's strange to be punishing ourselves this way. It's not healthy.''