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"Men In Black 3" New York Premiere - Inside Arrivals

NEW YORK, NY - MAY 23: Will Smith and Jada Pinkett Smith attend the "Men In Black 3" New York Premiere at Ziegfeld Theatre on May 23, 2012 in New York City. (Photo by Stephen Lovekin/Getty Images)

Hollywood's on-set romances

It was love at first sight or, more likely, in the case of these star-crossed couples, when the director yelled "Cut, that's a wrap!"