By Andy Greene Howard Stern returned from a spring hiatus Monday morning, and revealed to his Sirius/XM audience that he’s one of the millions of Americans watching Ryan Murphy’s new season of Love Story, which chronicles the tragic saga of John F. Kennedy Jr. and Carolyn Bessette. But unlike most viewers, Stern had a relationship with both of them. “I knew the real Carolyn Bessette,” he said. “I won’t say I knew her well, but we had many, many conversations, more than casual conversations. She was very lovely. She was like a really nice woman … I don’t want to go into how I knew her, but I knew her. I know enough to keep my mouth shut about that. Some stuff you do have to keep private … But she was very nice to me, very open and talkative. She didn’t give me the nose-up-in-the air kind of thing. I don’t have any juicy, gossipy story.” He also spent time with John F. Kennedy Jr. when he agreed to pose for the April 1996 cover of his magazine George. “He actually showed up to the shoot,” Stern said.…