Machine Gun Kelly is taking his “Bloody Valentine” literally.

For Valentine’s Day, the Tickets to My Downfall rapper celebrated his love for Megan Fox by posting a series of photos including one of an orb necklace that appears to contain a drop of his girlfriend’s blood.

“i wear your blood around my neck,” MGK captioned the post while tagging “My Bloody Valentine” as the location, a reference to his “Bloody Valentine” music video co-starring Fox.

They’re not the first celebrity couple to solidify their bond with blood. Angelina Jolie and Billy Bob Thornton famously wore vials with each other’s blood during their marriage in the early 2000s.

Taking to Instagram, Fox also shared a sweet Valentine’s Day tribute to her boyfriend. “There goes my heart manifest outside of my body draped in the towering silhouette of a most unusually handsome boy,” she captioned her slideshow, adding, “The journey will likely be perilous but there is no destination without him.”

Just last month, the pair sparked engagement rumors after Fox was photographed wearing a massive ring on her left hand while out with MGK in New York City. However, the Transformers actress later appeared to deny the rumors.

Kelly, 30, and Fox, 34, met while filming Midnight in the Switchgrass in Puerto Rico in May. They haven’t been shy to show PDA on social media and in MGK’s steamy video for “Bloody Valentine” following Fox’s split from husband Brian Austin Green.