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Brad & Angie met and wooed filming spy thriller "Mr And Mrs Smith", At the time, Brad was still married to Jennifer Aniston
Liz and Dick met on the set of "Cleopatra" playing lovers Marc Anthony and Cleopatra. She was still married to crooner Eddie Fisher. Dick and Liz wed AND divorced twice!
Ben and Jen battled and then fell love in their super-hero guises in "Daredevil". Nowadays they're too busy making babies to wage war on crime.
Despite remaining married to his Catholic wife, Spencer Tracy and Katharine Hepburn first lit up the screen together in "Woman of the Year" and then the bedroom for over 25 years.
Heath and Michelle fell in love during the filming of "Cold Back Mountain". The eventually split up but not before Heath fathered a daughter with Michelle, Mathilda.
Bogey and Bacall met filming Hemingway's "To Have and Have Not". Bogie decide "to have" and the two were quickly wed. Bacall was with Bogart until he died.
He took a bite - she swooned - it was "Twilight" time for Robert Pattinson & Kristin Stewart. Long denied, oft rumored, they finally admitted their love for one another. And the the inevitable storm of "cheating"...