IN THIS ISSUE: John's Now a Changed Man for Jen

John Mayer may have been "the one that got away" for Jennifer Aniston, but a pal tells OK! in the new issue — on sales everywhere now — that John's been making changes to his life to win Jen back. The main one being to stop blabbing to the press about his personal life!

OK! COVER STORY: JEN ANISTON — I'M BACK WITH JOHN

John's known for being a player and even discussing private details of his relationships with publications like Playboy, but he's now a changed man.

A friend tells OK! that John convinced Jen, over long phone conversations, that he has changed and "hadn't been dating, that he'd given up one-night stands and hooking up with groupies and was done mouthing off to the press about his private life."

OK! IN THIS ISSUE: FOR JEN, JOHN'S "THE ONE WHO GOT AWAY"

And he's living up to his end and keeping quiet, so far. When asked about the renewed romance, John's camp demurred, saying: "Although the two remain friends, there's no truth to any of these rumors."

John is not only zipping his lips to the press, but he's even deleted his beloved Twitter account.

FOR MORE ON JENNIFER ANISTON TAKING BACK JOHN MAYER, PICK UP THE NEW ISSUE OF OK! IN STORES NOW!