Will Smith chatted it up with David Letterman where he revealed why he slapped a reporter recently. Watch the clip inside and see what 2 Chainz said about the NYPD and his swag.

We told you earlier that Will Smith slapped a reporter while on his promo runs after the reporter tried to kiss him, and now we know why from the horse's mouth.  He told David Letterman this week, "It was just awkward, Dave.  They were like, 'Oh, no, we’re sorry, you know. It’s just his 'schtick,' you know. And I said, 'well, that’s why his a** got schtuck.'" 

Will breaks down the slap here:

Don't forget Men In Black 3 hits the big screen this Friday.

Also in music........

2 Chainz called into MTV News earlier to complain that the NYPD had tried to assassinate his swag with his arrest yesterday for allegedly having brass knuckles at the airport. He said,

"They tried to assassinate my character, they tried to assassinate my swag.  It was just a negative dilemma earlier where someone misconstrued a piece of jewelry for a weapon and stuff.  Me just trying to explain it was getting too frustrating, me just trying to explain my occupation and then when they finally got to the jail and everybody knew who I was, then they started calling their kids and putting me on the phone with their kids. It was like a weird experience."

On top of that......they kept the ring!  He added, "Yeah, they took it from me. They took the Louis [Vuitton] case that I actually keep the jewelry in, they took that. I couldn't believe it."

On Twitter, he said, "Sorry to alll the negative people who wanted me out the way...kant let u have the game bak that ez....And oh yeh they took my Louis V. traveling case... Smh! Petty I got that from Saudi Arabia...Materials kan b replaced!2blessed2stress. A RING THOUGH!!!"

Ha!