Katy Perry And Boyfriend John Mayer Celebrate Her SNL Roar Performance [VIDEO]; Katy Turns Down "Genius" John's Marriage Proposal? Popstar "Doesn't Feel Ready" For Wedding

Katy Perry and boyfriend John Mayer were spotted leaving the Hearland Brewery in Times Square New York City at 3 AM.  
The couple were out celebrating after Katy Perry's successful Saturday Night Live performance.  Katy Perry sang "Walking on Air", "Prism" and her hit "Roar" to a packed house, including boyfriend John Mayer.
Katy Perry recently shared her feelings for boyfriend John Mayer in an interview with Billboard magazine, calling him a "genius":"He literally is a genius, as is evident from his songwriting. I always tell him, 'Darling, you know I'm going to have to give your mind to science after you've passed, because we're going to have to understand how all these sparks work.' We'll be in bed, and he'll be doing the crossword puzzle. Every night, he tries to finish it in under 10 minutes. When he puts his mind to something, he really gets it done very well. I always ask for his help."
However, according to a source for Popcrush, Katy Perry recently turned down boyfriend John Mayer when he proposed to her, because she "doesn't feel ready":  "John's proposal really unnerved Katy.  Even though they have discussed it, she thought it was too soon. John was gutted."
Watch Katy Perry boyfriend John Mayer video here:  

The source continued, "Katy loves John, but doesn't feel she has had enough healing time since her divorce. She told him she just needed a bit more time to feel whole in herself again."