Alec Baldwin offers F-ing explanation for photog fight

Alec Baldwin dropped his pants (to prove he'd lost weight) during his appearance on "Late Show With David Letterman" Wednesday night. He also dropped a pretty funny explanation for his scuffle with a New York Daily News photographer on Tuesday. "Let's get to it, shall we? You're obviously burning to hold up the cover of the Daily News," Baldwin told the host. "I think you can see I'm forming the letter 'F' with my mouth. And what I'm saying is ... 'What f-stop are you on with the camera?' And he said, 'I'm on a something,' and I said, 'That's not the f-stop.' 'Cause you [have to] set the camera on the right f-stop."