Lady Gaga revealed the name of her forthcoming third LP last month, when she tweeted a photo of the album title, ARTPOP, on her arm. But she's already been back for more work, revealing a new tattoo this weekend. The new ink, which adorns the upper left part of her rib cage, is an anchor, which Gaga appeared to dub the "Stamp of His Mermaid." What exactly it refers to, we're not sure. Like most things Gaga-related, it's something of a mystery.