sheen-lettermanCharlie Sheen insists he was clean during his infamous 2011 meltdown that cost him his job on the hit television show “Two and a Half Men.” Then, what made him go whack? You won’t believe it.

Sheen dropped by the Late Show with David Letterman last night (Jan. 14) an set the record straight about his drug use.

When Letterman suggested with a question that crack cocaine was at the root of his meltdown, Charlie said it was much more complicated than that.

“Here’s the confusing part. I wish it was crack cocaine. It wish it was an ocean of vodka, a bathtub full of pills,” he explained.

But it was something far more powerful: righteous indignation!

“It was just my brain was kind of separated into itself. I just had to take a stand for what I know was right,” he said.

Letterman, of course, was incredulous and pressed Sheen on it. “Not during the meltdown,” the Anger Management star said. “During the previous 30 years of my life.”

Sheen’s antics are back in the news again. He had a very public hookup with 24-year-old lesbian porn star Georgia Jones in Cabo San Lucas, Mexico.

He was there for the launch of a new bar in the ritzy Hotel El Ganzo. Jones, a former Penthouse Pet, provided some eye candy. Los Angeles Mayor Antonio Villaraigosa was also on hand.

Sheen tweeted a photo with the major and immediately touched off a political crisis. Villaraigosa said they spent all of “three minutes” together; Sheen said they partied for hours.

Check out the video below an be sure to follow TheImproper on Twitter for all the latest celebrity updates.