The singers are said to have rekindled their romance after a brief split, and Perry is allegedly so serious about Mayer that she has given him a key to her home.
A source told 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 makes sense."
The couple recently took a trip to Las Vegas with friends and apparently joked about getting hitched in an Elvis chapel, but didn't go through with it.
The stars are also said to have enjoyed a night out partying at the Spearmint Rhino strip club with friends.
An insider said: "They were together in a group. As for whether they got dances, they were in a strip club... you do the math.
"The group had so much fun, they stayed until 5am."