When you've got an event that's already jam-packed with celebrities, it's no easy feat to find a surprise guest who's famous enough to get the crowd truly excited.
Enter Michelle Obama.
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The former First Lady made an appearance during Sunday's Grammy Awards, walking on stage hand-in-hand with Jada Pinkett Smith, Lady Gaga, Alicia Keys and Jennifer Lopez.
Michelle Obama walks out on the Grammys stage with Lady...