use of question marks

I have always worked on the basis that question marks were full stops as well, but consider the following sentence from a blog post:

"Who's Justin Bieber?" you might say.

This seems to be a punctuation nightmare. I want the question mark in there, but it doesn't feel right to start a new sentence directly after it. It feels as though there should be a comma. What is the correct form?

Answers
Nope, the way you are writing is correct!
coolkid13
07 October 2011
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