Star magazine claims John has been searching for the "perfect vintage engagement ring" to slip on the finger of the former Mrs. Russell Brand, 28.
"Katy's been telling everyone they're getting married," alleges a pal. "All her friends are worried she'll end up heartbroken again, but she keeps saying John is the one."
Anything else, chatty spy?
"It's funny -- both of them used to be so wild," opines the source, "but now they just spend most nights at home and watching movies. They're inseparable!"
Click on for more photos of John and Katy's together-time ...
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