Seinfeld Fans: Remember These A-Listers Who Guest Starred Before Becoming Famous?

Jeremy Piven

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Episode: “The Pilot” (Season 4, Episode 23)

Yes…that is Jeremy Piven. We aren’t sure whether he shaved his head (or if he’s bald), but Piven set out to play Costanza in the famed ‘Pilot’ episode. We have to admit, he looks pretty spot-on in this capacity. As many know, Piven’s breakout role came as explosive super agent Ari Gold in Entourage.