Katy Perry is a gigantic superstar, quite possibly the biggest popstar on the planet.

After all that, there are still a few things you might not know about John Mayer's ex.

1. Katy Perry isn't her real name. She was born Kate Hudson. Sound familiar? That's why she changed it.

2. Despite the name change, she did release an album under the name Katy Hudson.

3. Katy Hudson released a Christian album.

4. When Katy changed her name to Katy Perry, she chose Perry because it was her Mom's maiden name.

5. Katy Perry used to date Travie McCoy from Gym Class Heroes. They broke up in 2009.

6. Katy Perry's "I Kissed A Girl" is partially based on Scarlett Johansson.

7. I thought Katy Perry favorite ice cream flavor was vanilla. It's actually bubble gum.

8. Katy Perry was offered $20,000,000 to be a judge on American Idol. She turned it down.

9. Money has no value to Katy Perry (see above). I'm just guessing on this one.

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