'Tis the season for holiday parties. We all want to look great for the photos, right? Tonight the winner of a victoria's secret model search is going to show us how. But it is not what you might... See More
'Tis the season for holiday parties. We all want to look great for the photos, right? Tonight the winner of a victoria's secret model search is going to show us how. But it is not what you might think. Looking good, of course, but less sexy and more covered up. That's her advice. This former model on a motion to change what we wear. W did she become an unlikely crusader for covering up? Here's abc's correspondent. Reporter: The victoria's secret runway, the fame, the fortune. And she was the it girl at the top of her game, beating out 10,000 women to win the victoria's secret model search competition. The winner of the victoria's secret model search is kylie. Reporter: In a stunning twist, kylie decided overnight to ditch the run way for jesus. I watch the tape of you winning you are screaming, so excited. So when did that change? You know, being sent out after that on different photo shoots. Having my pictures end up on pornographic sites. And when I brought tight my modeling agency they said basically all the victoria's models have pictures on pornographic web sites what did you expect. Was it your faith that made you finally say I'm walking away. Yeah, god definitely convicted my heart about it. Victor yeah's secret fame brought her big time jobs like this, racy spread for fhm magazine. Kylie is part of models, ditching the spotlight for christ. And cashing in with a book. A christian clothing line and nationwide speaking tours. In our so tie, sex sells. Kylie's tell-all memoir, I'm no angel. Dishing on the dark sides, photo shoots to eating disorders. I know a girl that had thrown up so much. It was an automatic thing. Drinking lemonade. She would throw it up. When her book released, victoria's secret pushed back saying she xaj rated her relation shm with them. It seems kylie has used her past as a launch pad for a burgeoning business. The fact that we are talking about what it that's you were doing as a victoria's secret model is bringing attention to what you say you didn't want to bring attention to? Isn't there a hypocrisy in that? The images? We'll show your images on "nightline." Yeah, that's something that it its hard for me. That I have to deal with now. You weren't a top, top model. So, are you just -- bashing then dus tr -- the industry because you didn't make it. I am not really here to bash the industry. Just here to tell what happened to me from the eating disorders, my agency calling me a fat cow when I was 118 pounds. They called you that? 118 pounds and 5'10." Wonder what they would say about me. Kylie's former agency says at no time has any model been called a fat cow. And they had no knowledge of any of her photos being used on porn sites. At the church book signing, they can't get u.N. Many are young girls dealing with insecurity. Reporter: You are clearly a beautiful young woman. Wearing makeup, your hair is done you. Have high heels, skinny pants on. How do you reconcile that with the message you are teaching? Well, I still believe in taking care of yourself. And, dressing nice. You don't have to wear a burlap sack or anything. You can be sexy and be evangelical christian. I only want to be sexy nor my husband. Now, you know when we are alone. And so, I don't want to go out in public and be that way for other men to see me. Reporter: Like kylie, nicole, struggled to mix glamour with her faith. She too left the industry to become a consultant. I just wanted to befamous. It would make me happy. At 5'10", she was told her curves pose aid problem. My agent said my hips were too wide. Just the way I was built I could never do that. I was embarrassed. I left the agency crying. Nicole's former agent toemd us she doesn't make statements like that to models. Four years later, nicole shunned her provocative past. To day her faith its front and center. Spending her days offering advice on everything from clothes to relationships. Sunny gives a couple of tweens a modesty makeover. You could put a cute little cardigan over it. It is covered up. I love polka dots. Anything is so cute. You look beautiful. Thank you. Modest is hospitalest. Modest is hottest. Of then I thought back to your pictures that I saw before I came here. It sort of lead to a crisis of who've I was. Here hype was, showing it auz all and I felt ashamed. When she is not a personal shopper, she runs ate website. Project inspired. Christian fans can find her message. Another way you can give your jouft fit a fashionable look without showing a lot of skin. This is one of nicole's monthly god talk, reading scripture to young girls over video chat. Jesus tells us to examine our motive and our own conduct. In stead of judging others. I am more full filled now that I have god in my life, than type thought I could be measu measuring what the agents wanted me to do. Back in idaho, kylie is working on descenes for her clothing line, got inspired fashion. Every design meeting starts with a prayer. We just pray, that we will change lives and soften hearts in god and jeep sus's name. I think we are going to open it up. The last couple weeks. We ftry to stick with bible verses, rather than sayings or slogans. So the bible versuses say ipt love my husband. I love my wife. Why would you want these biblical verses all over your clothes? A way for me to share my faith. Or share what I believe with other people. Reporter: Her psalm 23 scarf sold out in one day. Keep producing more. Everyone loves the scarf. At first glance, some of kylie's clothes seem appropriate for a night out. Girl, woman? It's one of her nicer tops torturech or school. Some would say this is not the most modest shirt out there. Sure they would. Rancheros in time for christmas, both women are catering to young viewers, she expanded to teach girls how to look marvelous and beep modest for the holidays. Why goal with the christmas program tell girls you can care about fashion, but do it modest way. Modest is hottest. While kylie its ever popular it now comes in christmas colo colors. For "nightline," cecelia vega, california. Whether sincere like kobe bryant or spoofing look ellen --
This transcript has been automatically generated and may not be 100% accurate.