LOS ANGELLES: Katy Perry might be getting married again! Sources say the singer’s boyfriend, rocker John Mayer, is planning to pop the question - and has even written a song for her. Mayer is a renowned ladies’ man who has dated some of Hollywood’s most beautiful women, including Jennifer Aniston - but meeting Katy has made him a different man. “She’s changed his life for ever,” a source said. “This is the most serious John has been about anyone and he wants to make it official. “Their romance is so strong - so it shouldn’t be too long before he gets down on one knee.” –SP