See Lady Gaga’s Topless “Cannabis Queen” Halloween Costume (PHOTO)

We’re starting to think Lady Gaga and Rihanna are in cahoots with each other.

Both pop stars dressed in marijuana-themed Halloween costumes, but Gaga’s was the real show-stopper. The singer went practically topless last night during a wild Halloween party. Click through the gallery to see her risque getup!

11.2.2012 / 12:49 AM EDT by Tiffany Wan
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