Miley Cyrus grew up in Hollywood playing Hannah Montana, so you would expect she would have some childhood friends that were also in the business.

But you probably wouldn't think her oldest buddy was none other than Katy Perry, especially given their eight year age gap.

Miley explains: "When she came out with 'I Kissed a Girl' I was doing Hannah Montana and she asked me to go to the VMAs with her. That's how we met. We've stayed friends and realized the other day it's been 10 years, making her my friend I've known the longest. It's weird.”

Miley's latest single "Malibu" is out now.

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