Perry, Mayer no longer datingKaty Perry, 27, and John Mayer, 34, who were linked this summer, are no longer dating, People magazine reports. The pair had been casually dating for the past couple of months, recently being seen together having dinner at Chateau Marmont and attending an animal-filled birthday bash at a Hollywood talent agent's home. Perry recently divorced Russell Brand, and dated Florence + the Machine guitarist Robert Ackroyd earlier this year. Mayer has previously dated Jennifer Love Hewitt, Jessica Simpson and Jennifer Aniston.