Right now, we get up close and personal with giuliana and bill rancic. And bianna golodryga has found out their relationship right now is stronger than ever. Reporter: They're reality show red carpet... See More
Right now, we get up close and personal with giuliana and bill rancic. And bianna golodryga has found out their relationship right now is stronger than ever. Reporter: They're reality show red carpet darlings. Giuliana's drama has played out for all to see. For their struggle to have a baby. To her struggle with breast cancer. We've had some of the darkest days of our lives. Your life. To some of the greatest days of our lives. We would never trade it for anything. It's been incredible. Reporter: After undergoing multiple in vitro treatments, and a mammogram revealed shocking news. An aggressive form of breast cancer. I would be pounding the floor, going why? Why? Why is this happening to me? And thinking that I was going to die. Reporter: But then, just months after undergoing a double-mastectomy, giuliana and bill welcomed baby drew to their family, via surrogacy. It's a lot of work. Before we decide on baby number two, we want to make sure we can do it. Reporter: A growing family would be a dream come true. Something they longed for ever since they first met on e! When she interviewed him. Do you have a girlfriend? Well, not at the moment, no. What? Not at the moment. Really? Yeah. Really? I'm holding out. For what? I'm holding out for you? He so knows I wanted him to say that. Reporter: Just like that, he asked her out. I said -- that would be great, too. And we were engaged eight months later. Reporter: Their strong relationship is practically unheard of in reality tv, where many couples don't survive. That's why I love him. Reporter: How do you keep the marriage working? I think the difference between us and a lot of the other couples is from the beginning our foundation was very strong. And as the season passes, it's easier to do the show. We get it. We get there's cameras around. We never, ever cut anything out of the show. If I look like crap without my makeup, I don't care. We put everything in the show. Reporter: Now, this powerhouse couple are both best-selling authors. And bill announced a contest to help america rejuvenate small businesses. This year, we are granting one small business a commercial in the biggest football game of the year. Reporter: Wow. The super bowl. All-expense paid commercial. Reporter: The most important project is parenthood. Little duke lights up their day, every day. When I look at her and duke, we have a real family. Reporter: For "good morning america," bianna golodryga, abc news, los angeles.
This transcript has been automatically generated and may not be 100% accurate.