Lady Gaga was surprisingly not at her best buddy Perez Hilton's birthday party this weekend!

She was in Chicago, showing the famous House of Blues what she is made of!

The singer performed an amazing keyboard number for the audience that we thought was really awesome.

Famous for her inability to wear pants, Gaga's outfits rocked the show, and it was no surprise that once again she wowed the crowd with her skimpy numbers.

The Lady really is so hot right now!





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