of guy who likes to keep his private life private. He is going very public with a fight. All in response to what he calls a negligent even dangerous fabrication in a tabloid newspaper. What got him so... See More
of guy who likes to keep his private life private. He is going very public with a fight. All in response to what he calls a negligent even dangerous fabrication in a tabloid newspaper. What got him so riled up? Here's ABC's linzabc's Lindsay Davis. Reporter: He's been the subject of inaccurate claims, impending marriages and babies on the way. This time the notoriously private actor is going public. The star of the hit film "Gravity" couldn't help speak up and defend his future family calling the "Daily mail's" latest story about him completely fabricated. Earlier this week "The daily mail" british publication, reported his soon to be mother-in-law was oppose to his engagement to her daughter on religious ground, citing a friend of the family, say that she didn't think Clooney was good enough for her daughter. The report claiming that she was born into a faith offshoot of Islam that forbid intermarriage and several women have been murdered for disobeying the rules. End quote. The alleged friend of the family telling the daily mail that her mother has been telling half of Beirut there are 500,000, and none of them good enough. But the pictures tell a different story. Both George's mom and his fiancee's look like all was fine photographed walking together earlier this month near lake Cuomo. While Clooney the son of a retired journalist and subject of tabloid stories, says he respects freedom of speech. In an op-ed he slammed the daily mail for publishing a story that put his family and friend in harm's way. He said, quote, I seldom respond to tabloids unless it involves some one else and their safety or well being. Rebecca Ford from the Hollywood reporter has been tracking the story. This is his future mother-in-law. So I think that was kind of the -- the line in the sand for him. I think a lot of people are going to view this as chivalry, here he is standing up for them and just another reason women will continue to love him. Off awe in fact, Clooney goes on to say that Amal's family isn't part of the sect, I don't care if they fabricate stories of Amal being pregnant or that the marriage will take place on the set of Downton Abby, but this lie involves larger issues. To exploit religious differences where none exist is at the least negligent and more appropriately dangerous. The Clooney camp isn't interested in making any further comments but has told ABC news there has been an enormous response to his written statement. His 36-year-old fiancee Amal is a high-powered attorney, author and human rights activist based in Britain. Their wedding is reported to take place this September atÃ±r Clooney's home on lake Cuomo. The long term bachelor famously telling Barbara Walters that marrying again wouldn't be in his future. You said you never want to get married again? No, I won't marry again. How do you know you won't marry again? I know I am never going to get married again. Because I wasn't very good at it. It didn't work out for numerous amount of reasons. And most of them were probably my fault. But ultimate lowly I wasn't willing to fix those things. I wasn't willing to try to make them work. And I'm not going to -- I'm not going to, I don't want to screw anybody else up. Reporter: That was almost 20 years ago. Cleany was 34 at the time. The guy once called eternal bachelor is now ready to walk down the aisle again. In an e-mail to ABC news, mail online said the story was supplied in good faith by a reputable and trusted freelance journalist. However we accept Mr. Clooney's assurance that the story is inaccurate and we apologize. The piece that George Clooney wrote was so passion that and so well written and so intelligent that I don't think there is anything else the dailymail could have done to save face at that point. Reporter: It remains to be seen if Clooney will accept that apology for take it even further. A lot of times the tabloids will have no shame. But I think that when a letter like this comes from a celebrity directly, it is something that stands out. Los Angeles attorney Aaron moss who represented Katie Holmes in a successful case against "Star" magazine says there is a difference between the way british and American ones do business. British tabloids tend to be more vicious than their American counterparts. But the counterveiling issue is that it is much easier to sue a british tabloid than an American tabloid because of first amendment concerns. This isn't the first time the daily mail had to apologize due to an erroneous story. Including Elton John who sued the daily mail for libel after reporting he was rude to guests at a charity event. Earlier this year the paper printed an apology to j.k.rowling falsely reporting that people at her church taunted her for being a single mother. Rowling sued the paper and won. Kate winslet took on the daily mail winning $40,000 libel lawsuit after it posed the question should Kate winslet win an os scar for the world's most irritating actress. In this country Tom cruise settled a $50 million lawsuit from the publishers of "Life & style" magazine after he said he abandoned his daughter Suri. Why do some tabloids publish these stories? There is an insatiable appetite for celebrity gossip. And most of the time they know that celebrities are not going to do anything about it. For Clooney's part. He says the laughable tabloid crossed the line into an arena of inciting violence. And heap Ju just needed to set the record straight. For "Nightline," I'm Lindsay Davis in New York.
This transcript has been automatically generated and may not be 100% accurate.