Sienna Miller's sister, fashion designer Savannah Miller had her baby shower, where little sis Sienna spilled the beans on babies and her boyfriend Rhys.

Sienna Miller on babies: "I really want bubbies — I always have. I mean, I'm 27 and you have to think about these things, don't you? And Sav (sister Savannah) proves you can work and be a mum. It still scares me, though."

Fans, do you have any idea what scares Sienna? Say, she's afraid of being unable to be a wise manager of her time to do an actress and mommy duty. Hell, no! She might only be afraid of breast feeding...
Source: instyle