Sienna Miller feels ''complete'' since becoming a mother.

The 30-year-old actress - who gave birth to Marlowe, her first child with fiancé Tom Sturridge, last July - loves the experience of motherhood and admits it's a great feeling knowing that her daughter will always be the most important thing in her life.

Speaking in an interview with LOOK magazine, she said: ''I've never felt more complete than I do having become a mother. It's a huge loss of ego. I love it.

''It's an immense relief to have someone who will always be ultimately more important than yourself existing in the world. She's my everything.''

The 'Factory Girl' star claims her body doesn't feel like hers anymore, but she's grown to love her new image since giving birth because of the tiny human it's created.

She explained: ''Yeah, it's a completely different thing to me. It's not mine - all the attachment to its flaws is gone. You understand what breasts are for and I have such enormous respect for my body.''

Sienna - who planned to take a break after having her daughter, but changed her mind when she was offered a role in 'Foxcatcher' - insists she will try and keep her family together when she and Tom are both working but will always have Marlowe with her regardless of where she is in the world.

She said: ''We'll take turns working. At the moment, Tom's been doing a play on Broadway so we're all in New York. Then it's my turn after that. We'll try and stay together as a family as much as possible, but Marlowe will always be where I am.''