It's time to scratch those "running into Sienna Miller in a back alley" fantasies. Oh, we know you've had them. Anyways, unless you love yourself some S & M, you best be stearin' clear of Sienna, the bad-ass bitch.

We were wondering why Jude Law's nanny diaries did not cause more of a full-out cat fight between Sienna and Daisy Wright. Wonder no more:

"I'm quite looking forward to the day when our paths will cross, which I know they will," says Miller, 24, of Wright in February's Interview magazine. "She better live in fear."

Though the fact that Sienna said "I'm quite looking forward," takes away from her street cred just a bit, she totally wins points for knowing that when you really want to kick someone's ass, you can find them in the dark alleys they normally hang out in.

Sienna to Nanny: Beware [People]