Transcript for Paparazzi Turn Lenses on Stars' Kids: Fair Game or Cheap Shot?
the "20/20" family. And that is what we are talking about, family. A showbiz families and stars. It's one thing to be hounded by the paparazzi but it's another when you hear 6-year-olds saying, don't take your pictures. Get back, get back. Reporter: That scared little pink bundle is suri cruise. Just 6 years old, she is prime paparazzi prey. Guys, stop. Reporter: These days, celebrity kids are everywhere -- ON OUR TVs AND IN THE MAGAZINES. Which ones look like their parents? Who's the cutest? Wow, aren't they stylish? Is that one a pawn in a messy break-up? Stop taking pictures, guys. Reporter: This is the high price celebrity kids are paying for inherited fame, for being born into a hollywood family business. They haven't decided to become a famous person. You can't do that to them. Stop taking pictures! Reporter: And most of these kids, really, really hate it. Like landon, the son of blink-182 drummer travis barker. Stop taking pictures. I'm not kidding. When I walk up to school with my son and there are cameramen following me, he has a relationship with the camera that's antagonistic. His class pictures for two years have been this. And I think it's a shame for him. Reporter: This is totally illegal in, say, england or france. But it is totally legal here in the united states. It's a first amendment right. Why are we not protecting these children from the psychological damage, the harassment, the sense of persecution? Guys, stop it. You got enough pictures. Reporter: Some celebrity moms are fighting back. That right there is julia roberts chasing down a paparazzo from the school gates. You can turn your video camera off because I'm gonna talk to you about the fact that you're at a school where children go. Turn it off. Reporter: She is awesome. How was dinner? Dads are involved too. Cue ben affleck. I'll break your -- Reporter: Every day, a dozen photographers follow the affleck family everywhere they go. His daughters beg for this to stop. Stop taking pictures of us and our dad. Now! Get out! Reporter: But if a 6-year-old is saying, "please don't take my photograph," the paparazzi will not listen to that child and will continue taking those -- they'll take the photograph. Reporter: They'll take the photograph? They'll take the photograph. Because it tells a story. Reporter: Ricardo mendoza, an l.A. Paparazzo on the celeb beat seven days a week. He says, for example, he said he could not snap, for example, halle berry dropping her kid off at school. This is how you make a living is to harass children because my child is in there? She's at school. Leave children alone you -- idiots. Reporter: But just wait till you hear why. The financial gain that I'm not going to get out of that, it's not worth the hassle of hearing her yell at me. Reporter: The pic, he says, is worth only $250. Okay, but let's say the shot of halle berry and her kid was going to get you 100 grand? I'd take the shot in a heartbeat. I'll take two shots. Reporter: And mendoza says he's one of the nicer guys lurking in the bushes. He never gets closer than five or six feet. He's friendly. We rolled with him around l.A. For an afternoon. Fishing, he calls it. Within minutes, a catch. There's kelly osbourne there. Right there. Reporter: A celebrity child, although kelly osbourne is almost grown up. Within hours, that snap was in "the daily mail." The process, well, a little weird for me. I felt a bit shy to get out of the car. Like you're not worthy of it almost. Reporter: No, it's more that I feel weird getting in someone's space. Mendoza has a network of informants, valets, baristas, ladies who lunch, on the lookout and calling in tips. Where should I go? Jones street. Reporter: Actress jenna dewan, wife of "magic mike" star channing tatum, is doing yoga. And she's pregnant. Pregnant is good? Pregnant is good. Reporter: Soon more photographers arrive, two dozen in all. But don't try to pap the paparazzi. And there she is. Will she be so mellow with a baby in tow? You're getting that close to me. Reporter: But don't lose your temper. A celebrity having a meltdown is the ultimate money shot. What they want to do is provoke you. If they do provoke you, they are won and you have lost. You are going to come at me and try to get a reaction. There's my reaction. We're all good. Reporter: How do you feel when you're five or six feet away from somebody taking photographs of them, and you know that they are not enjoying that experience, and that they want you gone? Personally I feel like I'm still showing the mass market what they might want. And if it's not me, it's going to be that little joe schmo with the mobile camera. Those little, those little smart phones now, everyone is a paparazzi now. Good luck. Reporter: We, the public, buy these magazines, watch these tv shows. Is that the bottom line? We do public events. They are very welcome to come and work with us and take the picture in situations when we both agree to do something together. But them running errands during the day or bringing their kid to school, I just don't think that's right. Reporter: Kevin mazur, a celebrity photographer, the kind who gets invited inside, just made a documentary about the paparazzi. It's called "sellebrity." They range from $250 to $250,000. It's like hitting the lottery for them. And that's why there is so many of 'em out there. Reporter: Mazur's advice -- go the beyonce and jay-z route and release a photo spread of your kids. Undercut the paparazzi. Steal their exclusive. Does that really work? Yeah, nobody is going to buy pictures if they are out there. Reporter: The riches out will it ever stop? I don't think it's going to change. When we reach our lowest, we seem to dig lower. There are so many people trying to sell pictures of celebrity kids, you are not argue about the ethics of it. It's not like a handbag. He's a person. Take me for all you like. It's the photographer. It's the general public. The general public want fos see it. Reporter: He has photo graphed his share of crotch shots and he says it's his duty to show the family lives of celebrities. The public sees celebrities as role models, so the public must see the good as well as the bad. I have to show the foundation of family. That is my zbfs that is the only one I need. I ask for this life. And kind of knew this was part of it. There's a price to fame. Are you willing to pay it?
This transcript has been automatically generated and may not be 100% accurate.