Johnny Nunez, WireImage
"My first tattoo I've ever done!!! 'MGK' on the ass cheek. Best f---in fans in the world. LTFU!! http://lockerz.com/s/176025619," he wrote via Twitter.
In the photo, which Machine Gun Kelly supplied to his 220,000 Twitter followers, he poses with a smile on his face, fitted cap turned backwards and has his black glove-covered hands resting on a woman's buttocks. The 'Wild Boy' creator's initials are shown on her rear while she lays on a chair in a tattoo shop.
MGK, whose tattoos include an Interstate 71 North sign, a symbol of anarchy and the words "Almost Famous," signed to Diddy's Bad Boy Records in August 2011. That same month he was arrested for inciting a flash mob at an Ohio mall. He's currently crafting his debut album, 'Lace Up' -- his motto -- for a 2012 release.