The 54-year-old Long Island native was en route to getting a marriage license with his 28-year-old fiancee, Hilaria Thomas, when he got physically engaged with New York Daily News photographer Marcus Santo, who has since spoken with authorities about the incident.
The notoriously hot-headed Glengarry Glen Ross star -- who walked out to Pat Benatar's Hit Me With Your Best Shot -- broke the ice by dropping his pants to show off all the weight he'd lost just in time for the start of summer.
In discussing the fiasco, Baldwin said Santo has done "the same thing to me before," as in invading his personal space on the street.
“They want you to react: they want you to take a punch or push them or something,” Baldwin said of the paps, adding that "no one got punched" during the run-in.
Baldwin said he would have been arrested had he punched the man, at which point he would have pressed charges on the shutterbug for assault.
“You don’t want to know what would happen in the jail cell if we were together in the jail cell!” the mercurial star joked.
“The picture, without knowing the story, tells a tale that’s not often true,” Letterman said, before unveiling a cover of the New York Daily News with an up close image of the star and photographer clashing.
“I think you can see, I’m forming the letter ‘F’ with my mouth, and what I’m saying is -- I said to him as I walked up to him, 'What F-stop are you on with the camera?'" Baldwin said.
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