Say what!? Joseph Gordon-Levitt has himself a secret girlfriend! The Don Jon actor revealed the news during an interview on SiriusXM's Howard Stern Show on Tuesday, Sept. 24. This marks the first time the 32-year-old has mentioned his love life in detail in public -- ever! 
 
 "I have a girlfriend but I tend not to really like to talk about it in public," he told Stern during the sit-down. "She is not in show business." 
 
 PHOTOS: Hollywood's hottest young stars 
 
 The Dark Knight Rises star further explained why he's never spoken out before about the relationship. "I get up in movies and I play other people, so when the audience is watching me in movies, I don't want them thinking about me and who I'm dating, and blah blah blah," he said. "I want them to see the character, the story that I'm telling." 
 
 The couple met through "mutual friends," he said, but the actor wouldn't go into further detail. When asked if he's in love, the Looper actor replied, "Oh, jeez, man! Come on! This is getting private." 
 
 PHOTOS: Hollywood's biggest flirts 
 
 Indeed, keeping private is something his girlfriend would like to do as well. "The girl that I'm with, she really doesn't want to be a part of it," he said of staying out of the spotlight. "You can imagine not wanting to have that kind of scrutiny." 
 
 PHOTOS: The Dark Knight Rises movie preview 
 
 Oddly enough, the big reveal comes just two weeks after the Hollywood A-lister discussed the ever-present rumors about his sexuality to Out magazine. "That would be really tacky —- they would win if I had to clarify," he said at the time. 

 Kate Upton and Maksim Chmerkovskiy made their first public outing as a couple when they walked hand in hand through the West Village neighborhood of NYC on Thursday. The pair seemed very happy and in love as they smiled and chatted during their stroll. Kate and Maksim, who has become famous for his work on Dancing With the Stars, were first linked in June when Kate was rumored to have celebrated her 21st birthday with the Ukranian hunk. They were reportedly spotted out on dates together around Manhattan and in the Hamptons, where Kate was filming The Other Woman with Cameron Diaz and Leslie Mann, over the Summer. When Kate was asked about her relationship with Maksim at the Style Awards earlier this month, the glowing model told reporters, "We’re just friends" — but we can likely take this latest PDA-filled city spin as confirmation that the two are definitely an item. 

 Robert Pattinson Is Dating Dylan Penn 
 
 Has Robert Pattinson found a new leading lady?Four months after splitting up with on-again, off-again girlfriend Kristen Stewart , the actor, 27, has been linked to model Dylan Penn."They've been dating a month or two," a Pattinson source confirms to PEOPLE. "He's crazy about her."The blonde beauty, 22, has quite the Hollywood pedigree: She's the daughter of Sean Penn and Robin Wright. According to media reports , Pattinson and Penn were spotted on Sept. 7 catching a show by rapper Mickey Avalon at the famed Viper Room in Los Angeles.They then reportedly hightailed it to the Chateau Marmont for post-show drinks and bites.Speculation has been swirling about whom Pattinson would date next following his split with Stewart. He was also recently seen with trainer Sydney Liebes outside Harley Pasternak's gym, where she works. But a second source shoots down any insinuation that the two are an item, telling PEOPLE that "Pattinson has trained with Liebes a few times in Harley's absence and that’s it."In May, Pattinson and Stewart, 23, called it quits after more than three years of dating, their relationship having weathered intense strain and scrutiny following her fling with her married Snow White and the Huntsman director, Rupert Sanders.The two had attempted to patch things up following her cheating scandal, attending Coachella and celebrating her 23rd birthday together before ultimately calling things off. On May 21, Pattinson was seen moving his belongings out of Stewart's Los Angeles home.
– Sorry, Kristen Stewart: Robert Pattinson is reportedly dating Sean Penn and Robin Wright's daughter, Dylan. "They've been dating a month or two," a source tells People. "He's crazy about her." Pattinson and Stewart were on-and-off for quite a while after she cheated with Rupert Sanders, but they officially broke up in May, People notes. Pattinson and Penn, 22, were first spotted together earlier this month. In other "new celebrity couple" news: Supermodel Kate Upton is dating Dancing With the Stars' Maksim Chmerkovskiy, PopSugar reports. They've been a rumored couple since June, but made their public debut walking hand-in-hand in New York yesterday (click to see the picture). Earlier this week, Joseph Gordon-Levitt revealed to Howard Stern that he has a girlfriend, Us reports. "I tend not to really like to talk about it in public," JGL said. "She is not in show business" and "really doesn't want to be a part of [the spotlight]," he added. They met through "mutual friends."