The US singer - who is engaged to English comic Russell Brand - is planning to apply for dual citizenship as soon as she ties the knot because she feels so close to her fiance's home nation.
She said: "When I get married next month, one of the first things I'll do is apply for dual citizenship.
"I'm not too sure if I have to take a test as I've not had time to look into it. But England is like my second home."
Although 25-year-old Katy says she loves the UK, she also has another reason for becoming a citizen.
She joked to UK TV talk show host Alan Carr: "I can just pass through Customs real quick. You've already kind of adopted me so maybe I don't have to go through all the paperwork?"
Meanwhile it has been revealed that Katy is so close to Russell's mother Barbara that she has started to call her Mum.
A source close to the singer said: "Katy has become close to Russell's mum. She adores Barbara. They're in constant contact and speak on the phone most days.
"Barbara has introduced her to the UK way of life, hoping Katy won't feel homesick when she's over here.
"They try and see each other as much as possible when they're in the same country. Katy joked that she calls her own mother Mom and Russell's mother Mum."
Katy also buys Barbara presents from around the world while she's working.
The source explained to the Daily Star newspaper: "Sometimes they're fridge magnets or a tacky souvenir but on Katy's latest trip to Paris she brought her a very nice saucy night dress."
