After appearing in three 1993 "Seinfeld" episodes, Piven took on a supporting role as Spence, Ellen DeGeneres' cousin on the sitcom "Ellen." The 48-year-old actor played crass Hollywood agent Ari Gold on the HBO series "Entourage" from 2004 to 2011. He picked up three Emmy Awards for the role. He currently stars in the PBS series "Mr. Selfridge." —XFINITY Entertainment Staff (Photo by Stuart C. Wilson/Getty Images)
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