Kristen Stewart, Robert Pattinson: No Hollywood Ending?

Movie stars' real-life romantic ups and downs enthrall audiences.
2:04 | 07/26/12

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Transcript for Kristen Stewart, Robert Pattinson: No Hollywood Ending?
And finally, for as long as we've loved our mu vis, we've been equally with our movie stars. Movie stars who have been in love with each other, literally. All day the internet has been ablaze with one of the young couples may be on the rox. Tonight, john donovan has more on this. Reporter: So love falters, as close followers of the kristen stewart/robert pattison real life romance know -- the one that had echoes in the on-screen passion of the characters they play in the "twilight" series. Real life kristen had been caught cheating on real life robert and has apologized publically. We've seen it before. A movie star jumps up and down on a couch to tell the world he's in love. They marry. They split. Okay, fine. But it's different when they also perform love as a story in a movie, as during his first marriage to nicole kidman, of course. Watch "eyes wide shut," and the line blurs. The feeling you get. They're not just acting. When pitt and jolie played mr. And mrs. Smith, the word was they fell in love during the making of the movie. So you watch it, and you wonder, had it all started yet the day they shot this scene? It's classic, really. Tracy and hepburn. Taylor and burton. Bogart and bacall. Watch "the big sleep," for example. The connection they had. Time was, that was for real. But here's the thing -- desilu broke up. Taylor and burton broke up. Cruise and kidman, of course, broke up. And where does that leave fans? Well, here's the thing -- kristen and robert may or may not be finished. But the scenes they shot didn't change. Time was, something in that was for real. And we know. We've seen that before. John donovan, abc news, pittman, new jersey. And we'll certainly see it again.

This transcript has been automatically generated and may not be 100% accurate.

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