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FILE - In this Nov. 16, 2011 file photo, British actor Robert Pattinson, left, and US actress Kristen Stewart arrive at the UK film premiere of "Twilight Breaking Dawn Part 1" at Westfield Stratford in east London. On Wednesday, July 25, 2012, Kristen Stewart and director Rupert Sanders are apologizing publicly to their loved ones following reports of infidelity. (AP Photo/Joel Ryan, File)

FILE - In this Nov. 16, 2011 file photo, British actor Robert Pattinson, left, and US actress Kristen Stewart arrive at the UK film premiere of "Twilight Breaking Dawn Part 1" at Westfield Stratford in east London. On Wednesday, July 25, 2012, Kristen Stewart and director Rupert Sanders are apologizing publicly to their loved ones following reports of infidelity. (AP Photo/Joel Ryan, File)

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!"