Rock Star or Rockstar?

pezie

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This seems like such a silly question.

When describing someone of musical fame (not the video game or energy drink), is it rock star or rockstar? I see it written as just one word a lot. I think proper grammar/spelling is two words though. My Google search is showing both. Does anyone know which way is correct? This would be for my blog, not my book (if it matters).

Thank you.