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Longtime friend of Michael Jackson, Liz Taylor hosted a viewing party for his doc, This Is It, at the MGM Grand in Vegas last weekend.

A source tells ET that Liz hosted her boyfriend, Jason Winters, her son Christopher Wilding, hairstylist Jose Eber and Michael's pal Miko Brando (Marlon's son.)

The diva was overheard saying, "The film was pure genius and the most magnificent film," and led a standing O as the credits rolled.