S. Diddy?

Is P.Diddy playing Casanova to Sienna Miller? The two were looking mighty cozy at the recent memorial concert for Princess Diana in London! Sienna denies that she's dating the rap mogul, telling ZeeNews.com, "I am in love with someone, but not Puff Daddy. He's just a good friend. Anyway, he has a beautiful girlfriend." Uh, not so -- Diddy and his longtime GF, Kim Porter just split up. Either Sienna needs to keep updated on her friends' relationships a new alibi, or she's gotta get a new alibi!

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