Factory Girl actress Sienna Miller, has found herself in yet another relationship breakdown, but this time she is the 'other woman'.

Sienna, who's relationship with Brit actor Jude Law came to an abrupt end when he was found in bed with his childrens nanny, has been getting very cosy with hip hop superstar P Diddy (or Puff Daddy, not really sure what he calls himself). They were spotted a couple of months ago, out and about  in London, which ended in Diddy taking Sienna back to her hotel in the early hours. More recently they were reportedly getting very up-close and personal at the Concert for Diana aftershow party.

Diddy, who has a girlfriend in the US, is known for his liking of the ladies but this time, his long-suffering partner and mother of his three kids Kim Porter (see pic), has had enough. Kim has apparently moved out of his New York apartment and Sienna is in the firing line.

So, Sienna has reversed the roles. But she better watch out. What's that saying....there is nothing worse than a woman scorned?! Yep, I definitely think that could be the case with poor Kim. Ouch!