The couple turned up grinning, clinging to each others hands and were spotted taking cute snaps of each other on their phones.
These phones to be exact:
Katy was also spotted running her hands through John's hair and putting on a proper, united smug couple front.
So yes, it would seem this is one couple we are just going to have to get used to.
Related Story: [Is John Mayer planning a proposal to Katy Perry]
And sharpish if the rumours are anything to go by.
The latest is that John is so smitten with Katy that he wants to propose! Yep, John reportedly thinks Katy is so brilliant that he wants to get down on one knee.
A source told The Evening Standard: "This is the first time John's felt so strongly about a girl. She's played her cards perfectly... It wouldn't surprise me at all if he proposed."
"John really likes the fact that Katy is so independent and not needy and clingy like the other girls he's dated," they told the paper.
In case you have forgotten, these 'other girls' include Taylor Swift, Jennifer Aniston and Cameron Diaz.
But could this really mark a turning point for The Player *ahem* Mayer?