Celebrity Anderson Cooper Says Mom Gloria Vanderbilt Is BFFs with Kathy Griffin: 'They Talk About Sex' Anderson Cooper says mom Gloria Vanderbilt, 92, spends more time with BFF Kathy Griffin than he does By Jeffrey Slonim and Lindsay Kimble Lindsay Kimble Lindsay Kimble is a Senior Digital News Editor and the Sports Editor for PEOPLE Digital. She's worked at PEOPLE for over seven years as a writer, reporter and editor across our Entertainment, Lifestyle and News teams, covering everything from the Super Bowl to the Met Gala. She's been nominated for the ASME NEXT Awards for Journalists Under 30, and previously wrote for Us Weekly while on staff at Wenner Media. People Editorial Guidelines Published on April 5, 2016 10:55 AM Share Tweet Pin Email Photo: Dennis Van Tine/ABACA Anderson Cooper is losing all his friends – to his mother! The CNN anchor tells PEOPLE at the premiere of his HBO documentary, Nothing Left Unsaid: Gloria Vanderbilt and Anderson Cooper, that pals including Kathy Griffin have developed relationships with his 92-year-old mom, Gloria Vanderbilt – and things can get pretty dishy. “Oh, my God, Kathy Griffin and my mom are very close friends,” Cooper reveals. “My mom hangs out with Kathy much more than she hangs out with me. There is no doubt about that.” The 48-year-old says that Vanderbilt, the famous socialite and denim designer, finds Griffith funny. “They talk about sex,” says Cooper. “They talk about all those things I have no interest in hearing about.” Vanderbilt’s candid nature is a cornerstone of her relationship with her son, as their upcoming documentary – and a recent interview with PEOPLE and Entertainment Weekly editorial director Jess Cagle – prove. “To know that her dating life has been far more interesting than my own is sort of, I’m not sure how I feel about that,” Cooper said on Tuesday. “It’s interesting and weird at the same time.” But that openness is enviable, according to Andy Cohen, another friend of the mother-son duo. “My mom and I have a very different relationship. My mom is a Jewish mom, and [Vanderbilt] is a shiksa goddess,” Cohen shares. “I don’t talk sex with my mom. And they did, and it’s interesting.” Nothing Left Unsaid: Gloria Vanderbilt and Anderson Cooper premieres on HBO on April 9.