2012's Top Celebrity Romances: Katie Couric Preview

"The Year With Katie Couric" reveals which couples' ups and downs made the most headlines.
4:39 | 12/19/12

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Transcript for 2012's Top Celebrity Romances: Katie Couric Preview
Also tonight, a big primetime special with katie couric. Called "the year with katie couric." What a year it was. You worked with "people" magazine on this jam-packed special. It's really fun, I have to say. It had nothing to do with me. The producers did an amazing job. Yo us 90 minutes and we'll give you the entire year. We cover so much, like the tragic events from hurricane sandy and the newtown shootings, to all the ups and downs in the presidential campaign and royal news. And there's entertainment news. This year, there were plenty of hot hollywood couples who sadly became so yesterday. Ah, celebrity romance. The love that lasts forever. From bad boys, to billionaires, to bachelorettes. There were plenty of fairy tale weddings to go around. But it was the failed long-term relationships in 2012 that were the most surprising. It was a bad year for having faith in relationships. Reporter: Including heidi and seal, who famously renewed their vows every year for six years. At your seventh, though, things began to get a little itchy. One day you're in. And the next day, you're out. Sometimes you're in. And sometimes, I dump you, seal. Reporter: The split seemed amicable at first, until rumors swirled that heidi was having an affair with martin kirsten, the family bodyguard. And seal got angry she was sleeping with the help. Maybe the help told her what she needed to hear. You is kind. You is smart. You is important. I think a lot of people were a little put off by his word choice. It's obviously not true. When -- you know, I've never looked at another man while i was with him. Reporter: There was another well-known scandal this year that involved "twilight's" on-screen and off-screen couple. I have a bad habit of underestimating you. Reporter: Rob pattinson and kristen stewart. When news broke that kristen was cheating with her "snow white and the huntsman" director, "twilight" fans felt like someone put a stake through their heart. It's hard to be a victim when you only have one facial expression. Reporter: But the breakup of all breakups this year -- have you ever felts thi way? That's how I feel about it. Reporter: The only person who was really surprised, tom cruise. The tom-kat divorce played out like a hollywood movie. Topping the tabloid box office for weeks. This was handled like a navy s.E.A.L. Team 6 operation. Like "mission impossible." Like "homeland." Fast. Like something out of a spy novel. She got out of there under cover of night. To run to new york, of all places. I ran into her on 42nd at midnight. Reporter: A blindsided tom cruise, had gone from a married man to a single dad in just 11 days. It happened so quick, in fact, I didn't even have a chance to pick sides. I didn't even get a chance to pray for little suri. Me, too. It wasn't all bad news in the hollywood romance department. Tonight, we'll tell you about the hollywood baby boom. And you'll hear from a lot of new moms, including beyonce. And you had fun with ryan lochte, huh? It's amazing how the names become household names just in a matter of months. So, I spent some time with ryan lochte. Got him to take his shirt off. Somebody's got to do it. There's always a new word in the dictionary. You know what an ear word is? It's a song. It's a word that means a song you can't get out of your head. So, I spent some time with carly rae jepsen because of "call me maybe." And dishonor roll? We spent some time talking about the people for whom it was not a good year, like lance armstrong, arnold schwarzenegger, and the perennial figure on that list, lindsay lohan. Yeah. And I have to really commend the producers. They did fabulous job. So much fun to watch. Today, you guys -- that's night at 9:30. Today, my show, we're doing a big gift idea show. The whole audience is full of moms that were affected by hurricane sandy. And they're getting all the gifts. That's great. That's so much fun. And we kept it a surprise. You have to check it out. We'll check that out. And a big special with katie couric tonight at 9:30, 8:30 central, right here on abc.

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

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