and John Mayer
's relationship is reportedly becoming serious.
The singers are said to have rekindled their romance after a brief split, and Katy is said to be so serious about John that she has given him a key to her home.
A source tells The Sun
: "John thinks it is easier to stay in hotels rather than his own LA pad [when he visits from New York]. But Katy insists he should stay with her. She thinks it ...