Photos from The People v. O.J. Simpson's Incredible Transformations

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Ron Galella/WireImage; FX

"Never in my life before had anyone told me that I looked like [Robert Kardashian]," David Schwimmer admits with a laugh. "But then I put the hair thing on, and then I guess I started to see it!" Co-star Malcolm-Jamal Warner (who plays O.J.'s best friend A.C. Cowlings) says David's transformation is the one that blew everyone away. "The most surreal was seeing David as Robert. We were all like, 'WOW, he looks just like him. Who knew?!'" Schwimmer adds that he spent most of his time making sure to get Kardashian's emotional resonance right, and spent hours on the phone with (ex-wife) Kris Jenner asking questions. "Most important to me was getting his spirit, and I hope I got it right."

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