Grammy Awards 2010
Michael Caulfield/WireImage
Lady Gaga
In a show-stopping opening number, Lady Gaga led her army of dancers in "Poker Face" before being joined onstage by Sir Elton John (not pictured) for a piano duet of "Your Song" and "Speechless." Lady Gaga wore a fantastic bold-shouldered creation by Armani Prive.Watch Lady Gaga's Performance Now
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The Night's Most Stylish Acts From the 2010 Grammys
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