Sienna Miller really wants babies but admits the idea does scare her, reports In Style magazine.

The actress revealed her broodiness at her fashion designer sister Savannah Miller's baby shower recently, claiming she has always wanted to have children.

"I mean, I'm nearly 27 and you have to think about these things, don't you?" she said. "And Sav proves you can work and be a mum. It still scares me though."

Savannah held the baby shower for her second child in west London, reports People magazine, where party ideas included a rock music soundtrack, multicoloured cupcakes, Earl Grey tea and rose champagne.

Commenting on her forthcoming marriage to Welsh actor Rhys Ifans, Sienna claimed her partner is as "mad as a box of frogs" but claimed she is hardly very different.

The Factory Girl star famously dated fellow British actor Jude Law, who she met on the set of Alfie.