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Wiz Khalifa, Bruno Mars

LOS ANGELES, CA - FEBRUARY 10: Rapper Wiz Khalifa (L) and singer Bruno Mars attend the 55th Annual GRAMMY Awards at STAPLES Center on February 10, 2013 in Los Angeles, California. (Photo by Rick Diamond/WireImage)

Famous Friends Mingle at the Grammys

A host of celebrity pals party together at the 2013 Grammys.