Remember early last year when artist Richard Prince portrayed a variety of people’s Instagram pictures at the Gagosian Gallery in New York? Well, if you don't then be sure to do a quick Google search under "New Portraits" to get an idea of the exhibition - because now he is being sued.

The exhibition saw Prince displaying a collection of enlarged screenshot Instagram images, which he then added his own commentary below and sold for up to $100,000.

The controversial artist never actually asked for permission to show these photographs and months on he has been sued for copyright infringement by photographer Donald Graham - with the photograph in question being Graham's Rastafarian Smoking a Joint.

For some more controversial art check out Richard Kern's exhibition, titled “New York Girls Revisited.”

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