Not because she won’t jump into bed with anyone hot and famous – just ask Leonardo DiCaprio. Or don’t, according to Miller.

Simply because theactress doesn’t wear pants. She prefers the look of granny underwear, the easier for new man candy, Diddy, to yank off before Kim Porter catches him.

Perhaps Isaac Cohen needs to purchase some panties for Sienna, as well, seeing her apparent taste in undergarments. No wonder Jude Law cheated on her with the nanny.