Nude preteen on album cover, legal or illegal? 10 pts?

I am asking for the United States: The scorpions album "virgin killer" has a nude preteen girl on the cover, is this legal to view or is it considered child pornography? You can easily find it on any search engine. Or is it legal becuase it is considered art? Please give detailed answer and I will... show more I am asking for the United States:

The scorpions album "virgin killer" has a nude preteen girl on the cover, is this legal to view or is it considered child pornography? You can easily find it on any search engine.

Or is it legal becuase it is considered art? Please give detailed answer and I will give 10 pts.
Update: For those who don't know the cover, she is clearly 11-13 years of age, posing provocatively and the only thing covering her genitals is a piece of glass.
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