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It's all black and white for party queen Gaga...

LADY Gaga was the party queen of New York last night with two star-studded bashes.

The singer first made a surprise appearance at the International Emmy Awards where she presented a gong dressed in a demure black dress.

Lady Gaga then switched to a white ensemble to cut the ribbon on her new workshop at Barney's of New York.

She was joined by stars such as Blake Lively (inset) and Alan Cumming.

At the Emmys, Christopher Eccleston and Julie Walters won the main acting awards. Accused, written and created by Jimmy McGovern, received the Emmy for best drama series at the 39th Annual Awards ceremony.

Walters was chosen as best actress for Mo. She portrayed the late Mo Mowlam, the unorthodox British politician who battled a brain tumour while working to forge the peace process in the North.