Oscar Confidential Interview With Bradley Cooper

Actor Bradley Cooper reveals what he told Jennifer Lawrence before their big hit.
3:00 | 02/24/14

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Transcript for Oscar Confidential Interview With Bradley Cooper
The countdown is onto the oscars. Tonight, what Bradley cooper told Jennifer Lawrence, long before the hustle. "Nightline" and Chris Connelly with the Oscar confidential. I'm not supposed to be talking like this, but I don't' care, I'll break the rules. Reporter: For Bradley cooper, breaking rules means balancing megacomedies like "The hangover" series -- We're getting married in five hours. Yeah. That's not going to happen. Reporter: With high-wire character work that's won his industry acclaim. You don't know anything about my marriage, okay, dad? Reporter: His performance as "American hustle's" FBI man Richie dimaso has earned the now 39-year-old a supporting actor nomination, his second Oscar nod in as many years. Each in collaboration with writer/director David O. Russell. In 2011, it was Russell who cast cooper for the lead roll of pat in "Silver linings playbook" with just days to go before shooting began. I thought, you know, I'm not right for this. Reporter: Despite all the parallels to your own life? Yeah, I think it was fear. Everything good? Uh-huh. I never really cried on film. I never had to do that. Reporter: He did do it. And well. Russell was eager to reteam with actors who'd made his last films fly. Whoa! Reporter: And no one in movies fascinating audiences quite like Jennifer Lawrence. I don't like change. "Hunger games" hadn't even come out yet, I remember we were eating dinner in Prague, and I think soembody came up and I signed an autograph. And she's like, "Wow, like, how do you --" and I just thought, "Oh, that's nothing what's going to happen to you." Reporter: Chris Connelly, ABC news, Los Angeles.

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

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