Paints a series of watercolors for his wife's office. WTF does Beth do that requires an office. NEW YORK – "They keep telling people it's the 10th anniversary. But it's the fourth season, as far as I'm concerned," says Howard Stern, who joined "America's Got Talent" as a judge in 2012. That's what you'd expect Howard to say. But quickly he adds that with "AGT" launching what everyone but Stern would consider its 10th season (8 tonight on NBC), he's having a ball with fellow judges Howie Mandel, Heidi Klum and Mel B (Melanie Brown). "I may be the most important judge in the history of the world, but secretly I'll tell you, I'm glad they're there," he confides during a recent interview. Everyone remembers the uproar when Stern was brought aboard this family-friendly talent competition: Wasn't he a legendary "shock jock," a bad-boy superstar on SiriusXM Radio who would say anything to get a reaction? Maybe, but Stern, now 61, thought he would make an ideal judge, that his long show-biz career (wasn't he the King of All Media?) would serve him well in evaluating each act. More to the point: He was already a big "AGT" fan. Like Stern, Mandel was an "AGT" devotee before he joined the judges' panel in 2010. "I watched every episode for the four years before that," Mandel says. "Whatever you see me saying and doing is what I was doing from the couch in my living room, in my underpants, before. Now I have the best seat in the house." And though he has to wear pants, "the show provides them," he says with a laugh. If the judges are having a good time, host Nick Cannon is having a blast. "I figure I'm the guy who's having the most fun," says Cannon, the "AGT" ringmaster since 2009. "It's the best summer job ever, even though there's a lot of responsibility." Responsibility like overseeing four opinionated, outspoken judges, plus an anything-can-happen string of acts — all of which, later in the season, takes place onstage at New York's Radio City Music Hall. It isn't all fun and games, even for the judges: careers are in their hands, and they know it. "I thought I would do one season, then, 'The joke's over, I did it, Howard Stern on a family-friendly show, ha-ha-ha.' But I ended up enjoying it," Stern said, "and, I swear to you, I take my role on it so seriously!" He thinks that's evident to viewers. And he figures he has proven to everyone, including himself, that he can be a team player. "That was a big ego adjustment for me. I'm so narcissistic that I think my opinion is the only thing that counts, and I really had to put that in check. Sometimes it's difficult to sit there while Heidi, Mel and Howie do their thing. But that's the beauty of it. And I particularly like when we argue about talent. I think that's so interesting." Like his fellow judges, Stern knows the choices he makes on the show can help launch a star or dash a lifetime of striving for stardom. He says he's awakened in the middle of the night after a broadcast, worried that he made the right decision. "I'm obsessed with getting things right," he explains. "I recently started painting. I know I'll never be great. But I'm so obsessed with being a really good painter. So even a hobby becomes like work: I've GOT to be good at this! I can't stand being so bad at it!" What does he paint? "I've painted a series of watercolors of flowers for my wife's office," he reports. Watercolors?! Flowers?! That just doesn't sound like Howard's style. "I know," he laughs. "It shocks the hell out of people. But after I was hired on a family-friendly TV show, there was nothing else shocking left for me to do."