Charlie Sheen, who made headlines for months this year with his drug- and alcohol-fueled bad behavior, says he is now clean and sober.

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UsMagazine.com said Wednesday Sheen told "Today's" Matt Lauer his emotional state is "a lot calmer" these days and he is "absolutely" sober.

"I don't really keep track of the time. It's been awhile," he said, referring to the last time he was under the influence.

"I don't really know what happened. It was one of those things where the planets were aligned, perfectly or imperfectly. I said some stuff and then it caught such traction globally and instantly that I couldn't really put out the fire," Sheen said. "From one moment to the next, I didn't know what was going to happen. It was pretty exciting."

Sheen said he has few regrets regarding that time in his life, UsMagazine.com reported.

"Looking back on it, I don't think I would trade it, but there are portions of it I would have amended a little bit," he told Lauer. "I don't know, the tiger blood [thing], it was so silly and people took it so seriously and I figured, alright, I'll continue to give the people what they want, you know?"

Sheen was fired this year from the sitcom "Two and a Half Men" after eight seasons because of his erratic behavior and substance abuse, as well as for disparaging remarks he made about series creator Chuck Lorre. He later announced he is planning to star in a comedy series inspired by the film "Anger Management," however, it is unclear exactly when or where the show might air. He was roasted last weekend during a program to air on Comedy Central Sept. 19, the same night at the Season 9 premiere of "Two and a Half Men."

During the past year he divorced his wife Brooke Mueller, who accused him of assaulting her. They have twin toddler sons.