Charles Melton is keeping Camila Mendes close to his heart -- semi-permanently!

The Riverdale co-stars made their real-life romance even more official when Melton showed off a "Cami" tatt -- short for his 24-year-old flame's first name -- on the left side of his chest.

Mendes shared her man's ink on Instagram Thursday, and while it looked pretty fresh, the actress later took to Twitter to share that it was just a stick-on.

"The tat is fake lol thought it was obvious from the sticky patch around it but guess not," she tweeted.

The pair have been public with their relationship since October of last year, when Mendes shared an adorable PDA pic of her and Melton, captioned simply, "Mine." And, with the new body art, it would appear that he's still hers!

Check out his totally believable tattoo below.

Meanwhile, Mendes may have Melton's heart in real-life, but in Ariana Grande's recent "Break Up With Your Girlfriend, I'm Bored" video, it's the 25-year-old pop star who seduces the 28-year-old heartthrob.

Watch the video below for Grande's recent Thank U, Next album decoded.

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