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Angelina Jolie & Brad Pitt
These two are domestic partners who share parenting duties for six children (three adopted, three biological) after meeting on the set of "Mr. and Mrs. Smitih." They are both repeat offenders, as itt famously dated Gwyneth Paltrow after meeting her on the set of "Se7en," while Jolie previously married and divorced co-stars Jonny Lee Miller ("Hackers") and Billy Bob Thornton ("Pushing Tin") and had a romantic relationship with model Jenny Shimizu, whom she met on the set of "Foxfire."