john-mayer-ellen.jpgMichael Rozman/Warner Bros.

John Mayer appears on The Ellen DeGeneres Show today, and the once sexy singer chats about why he's kept a low profile for the last two years and how he's grown up. Interestingly enough, he doesn't mention any of the famous ladies he's dated -- maybe he really has learned to control his verbal diarrhea!

John tells Ellen, "I just sort of lost my head for a little while ... I did a couple of some dumb interviews and it kind of woke me up." When Ellen brings up his infamous Playboy interview (you know, the one where he called ex-girlfriend Jessica Simpson "sexual napalm"), John replies, "Oh yeah, I don’t even remember having a Rolling Stone cover. It was a very strange time and it sort of rocketed me into adulthood. It was a violent crash into being an adult. For a couple of years it was just figuring it all out and I'm glad I actually stayed out of the spotlight. Because I think back then I would of said, give me two weeks or like let me get out and do Ellen and let me explain myself. It was like no, idiot. Go away be 33 and 34 instead of 28 for the 4th year."

Click through to find out why John's getting botox ... you might be surprised!