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The black-and-white snap features a giant moth on Gaga’s back, complete with a skull head, prompting speculation that she will be joining the metal band onstage for their 2016 song, “Moth Into Flame.”

“The Moth & Metallica,” Gaga captioned the topless photo on Sunday afternoon with a fire emoji, alongside the hashtags “#ink,” “#tattoo,” “#metal,” “#MetalliGa” and “#grammys.”