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Justin Timberlake, Jessica Biel, Beyonce Knowles, Jay-Z

LOS ANGELES, CA - FEBRUARY 10: (L-R) Singer Justin Timberlake, actress Jessica Biel, singer Beyonce and rapper Jay-Z attend the 55th Annual GRAMMY Awards at STAPLES Center on February 10, 2013 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for NARAS)

Famous Friends Mingle at the Grammys

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