The musician remained coy when quizzed about his relationship with the `Part of Me` singer - who he has been dating since June - but confessed he is content with how things are progressing between them.
He said: "I mean, I`m quite happy. I`m happy in all aspects of my life. I`m very happy in all aspects of my life."
Asked whether John could see himself settling down withKaty, 28, after a series of flings with the likes of Jennifer Aniston and Taylor Swift, the notorious womaniser hinted he wants a "traditional" lifestyle and hopes to walk down the aisle someday.
He quipped: "I want to live a very traditional life with a very untraditional day job. You know what I mean?"
The `Your Body Is A Wonderland` singer also opened up about his brand new outlook on life since undergoing a second throat surgery last September, admitting his health problems have made him completely "reconstruct" his values.
He told Rolling Stone magazine: "I think 35`s a great time. You investigate yourself, you know there are things that aren`t growing correctly, or serving you as you get older, and you break yourself down in a period of time.
"I`m actually lucky that I didn`t have to do that while I was on the road. I had a couple years off, and you deconstruct yourself. It`s very painful, and when you reconstruct yourself, you kind of have a fresh outlook on the next 20 years of your life."