Psssst! Joseph Gordon-Levitt has a secret girlfriend.
But he's not saying who.
Gordon-Levitt, 32, who plays a porn-addicted young man in "Don Jon," which he also directed and wrote, spoke about his lady love on SiriusXM's "The Howard Stern Show" but he wouldn't reveal her name, just little morsels about who she is and why he's never talked about her before.
"I have a girlfriend but I tend not to really like to talk about it in public," the "Dark Knight Rises" star said. "She is not in show business."
"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 told Stern. "I want them to see the character, the story that I'm telling, you know."
And apparently his girlfriend -- he refused to say how long they've been dating -- wants to stay out of the spotlight, too.
"The girl that I'm with, she really doesn't want to be a part of it and you can imagine not wanting to have that kind of scrutiny," he said.
Apparently the two met through "mutual friends" and when asked if he was in love, he shied away from the question.
"Oh, jeez, man! Come on! This is getting private."
Speaking of privates (and other vices), the actor talks about making an "adult film" about a man who can't connect with other people and how it could have been somewhat "autobiographical." (At least that's what Stern wanted it to be.)
The idea came about in 2008 and he finished the script while shooting "The Dark Knight Rises" and said he "was stoned" when he first thought of it as a comedy. (He also admitted he tried cocaine a few times but didn't like it, but liked LSD and didn't really do any other hard drugs. Then he made sure he made a PSA about being careful when doing drugs.)
"The first ideas of a Don Juan type of character -- watches too much pornography -- and a princess type of character, who watches too many romantic comedies," he said. "He likes the 'one-way thing,' he doesn't actually want to deal with a person, another human being."
The film also stars Scarlett Johansson, Julianne Moore and Tony Danza.
But in Gordon-Levitt's real life, he's "quick to run" in long-term relationships, Stern said.
"I think I'm a pretty good person and a good boyfriend. Yeah, I just wouldn't want to be with someone who was disrespectful to me."
When he was asked if he could be married and stay faithful, Gordon-Levitt waffled and said he didn't know if it was or wasn't for him.
"I think that I could partner up with somebody -- I don't know who that somebody is -- I could partner up with a woman and commit to we're going to raise a family and that's a project we're going to commit to for 20-something years."
He said he could be capable of being sexually monogamous during that time, but also said things may change after the kids are grown up.
"I like to not be too committed to any one future that's really far away, necessarily, unless there's a reason, which is why I'm saying if you're gonna raise a family ... I can make that commitment."
The film is in wide release Friday.
Follow Ministry of Gossip @LATcelebs.