Bogus Invoice

Check your iTunes Store purchase history, including hidden ones, and if applicable, other people in your family group.

If that item doesn't appear, forward the email to reportphishing@apple.com as an attachment and then delete it.

If that item does appear, change your password and click here.

If it doesn't appear there but shows up on a credit card statement, contact your bank.

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It's extremely likely to be a scam. The whole idea is to get you to click on a link in the email to "Cancel this order", or some other such thing that does not appear on any real invoice from Apple. It will take you to a fake site where they hope you'll enter your Apple ID and password - at minimum. Some even ask for your Social Security number.

Read it carefully. Are there a lot of spelling errors? Or a lot of really bad grammar? These are dead giveaways for scam emails.

Hover over any link on the email so a tool-tip appears, showing where the link actually goes. I would bet it's nowhere near apple.com .