Carole Radziwill opened up about her "last summer" with close friends John F. Kennedy Jr. and Carolyn Bessette-Kennedy in the gripping CNN docuseries American Prince. The three-part series revolved around John's lifelong struggle with his family's legacy as well as his whirlwind courtship and marriage to Carolyn before they died in a 1999 plane crash near Martha's Vineyard. (Carolyn's sister Lauren Bessette was also killed in the crash). As part of this unprecedented exploration of John's life, Real Housewives of New York City alum Carole also looked back on her own marriage to John's first cousin Anthony Radziwill, who died from cancer less than one month after John and the Bessette sisters were killed. (Anthony's mother, Lee Radziwiłł, was Jackie Kennedy's sister.) "All I could think of [when John and Carolyn died] was, I'm going to be the only one [of us] left," Carole said. Why JFK Jr. Didn't Call William and Harry After Princess Diana's Death American Prince premieres on CNN Saturday, August 9, at 9 p.m. ET. Keep scrolling for some of Carole's most poignant revelations from the doc: 'John John' One longstanding Kennedy family myth was dismissed in the opening segment of American Prince's debut episode, "The Boy Who Would Be King," as Carole casually denied that anyone in John's family ever called him "John John." Although John was known to have disliked the nickname, Carole's revelation was particularly surprising since her friend was referred to as "John John" in the media for his entire life. "This whole 'John John' thing, I don't know where it came from," the RHONY star admitted. "I think it was a press thing. Something happened where people thought that maybe his family called him, 'John John.'" She then clarified, "Some people just started saying ['John John'] to imply that they were close to him. I promise you, his sister didn't call him 'John John.' His mother, no one in his extended family, even like the extended cousins, ever called him 'John John.'" 'Everyone Was Hooking Up' Carole met her husband, Anthony, while they were both working at ABC News. While they eventually tied the knot in August 1994, Carole and Anthony were initially concerned about how their workplace relationship would be perceived. "Anthony and I started dating eight months after I first met him in L.A.," she remembered. "We were together, sort of casual[ly], because we were both at ABC News and we both felt like, 'Let's just keep this quiet.' But, of course, it was the '90s. Everyone was hooking up at work!" 'Girls' Girl' Carole recalled meeting Carolyn and forming an immediate bond with her very early in the former Calvin Klein PR agent's relationship with John. "She was so extraordinary in so many ways," Carole said of her friend. "We were in our late 20s at the time and she was the first girl I ever knew who was, like, this much over-used expression, 'girl's girl.' She was so beautiful." The What Remains author recognized that both she and Carolyn never quite fit in with the rest of the Kennedy clan. "It's a big family and like all big families, there's a lot of politics and quirks that you just have to learn. Maybe John's family more than other families," Carole acknowledged in American Prince's second episode. "There was a higher expectation and [Carolyn] didn't play the game. She didn't suck up to anyone, no one in his family." John F. Kennedy Jr. and Carolyn Bessette-Kennedy in 1995. Rose Hartman/Getty Images She continued, "Carolyn and I came from a very similar background. I grew up very from humble beginnings, like working class, upstate New York. Her mom was a single mom raising three daughters in a very working-class neighborhood. I think we felt like a real sisterhood because of it. We were like the ultimate outsiders." Two Cancer Battles Anthony suffered a recurrence of testicular cancer shortly before his and Carole's wedding, which coincided with his aunt Jackie Kennedy's own diagnosis with non-Hodgkins lymphoma in 1994. (Jackie died in May 1994 while Anthony succumbed to cancer in August 1999.) "It was very traumatic because, at that point, my fiancé was battling cancer," Carole said. Carole recalled a wrenching phone conversation where Anthony and Jackie each tried to break the news to one another about their diagnoses. "I remember him saying, 'OK, you go first.' Then, [Jackie] said, 'I have bad news that I've been diagnosed with lymphoma,'" Carole said. "The end [for Jackie] came pretty quickly. I remember it was a Sunday when we all were together and [by] Thursday, she passed away." 'Pig S*** and Horse Manure Everywhere' A significant portion of American Prince's second episode explored how John and Carolyn pulled off a private wedding in Cumberland Island, Georgia in September 1996. Friends and family confirmed that the couple only invited a few representatives from each branch of the Kennedy clan to prevent the paparazzi from finding out. "[John] was pretty much the most famous guy in the world. As a