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While Jude Law is in London, his seemingly on-again girlfriend Sienna Miller is keeping busy —and supporting the arts — in NYC. Sienna was at BAM theater in Brooklyn, NY, supporting Cate Blanchett on opening night of “A Streetcar Named Desire.”  

One fellow audience member dished to us EXCLUSIVELY, “Sienna was chain smoking between acts and afterwards, jumped into a big, black Escalade with a mystery man.  

Cate, we’re told, “got a five minute standing ovation,” but Sienna ran out before the applause died down.