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Lady Gaga gave clubgoers at Planet Hollywood's Krave in Las Vegas quite the surprise last night when she popped on stage for an unannounced performance.

Wearing a long blonde ponytail, Gaga rocked the house and left little to the imagination with her see-through outfit. Lady G is looking mighty fine these days!

With her new album Born This Way due out in May, the singer is promoting her latest song like crazy, and judging by the faces of the people in the crowd, they're loving what they hear. Viva La Gaga!