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The singer extends herself in Maui. Plus: Brangelina, Nicole & AM, Renée Zellweger and more

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PROFESSOR PORTMAN

Natalie Portman surprises students at New York's Columbia University on Monday as part of mtvU's celebrity guest lecturer series, Stand In. The native Israeli and Harvard grad dropped in on a "Terrorism and Counterterrorism" class; the episode airs March 13.

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