Tom Holland and Zendaya promoting "Spider-Man: Brand New Day" in Germany.

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If you look closely at a patch of skin on Zendaya's ribcage, you'll spy a tiny, discreet "T" tattooed in black ink. Her longtime partner, Tom Holland, has a similarly easy-to-miss "Z" tattoo tucked beneath his left arm.The permanent tributes to each other's initials go unseen at most events and red carpets, peeking out only in select moments — an almost too-perfect metaphor for Zendaya and Holland's public-facing relationship.Although Zendaya and Holland went Instagram-official in 2021, the exact timeline of their relationship is unknown. While many fans speculate the "Spider-Man" costars actually began dating years earlier, the couple's prudent navigation of fame and their respective careers means there's been precious little material to go on.Outside their promotional duties as Peter Parker and his love interest, MJ, in the MCU film franchise — their latest movie, "Spider-Man: Brand New Day," earned the biggest domestic box office debut in history — the actors rarely broadcast their relationship, on social media or otherwise. They have never walked a non-Marvel-related red carpet together, and fans can count on one hand how often they've kissed in sight of photographers.Even when news broke last year that Zendaya and Holland were engaged, there was no official announcement from the couple, let alone a collection of Instagram-friendly floral proposal photos. Zendaya simply began wearing a diamond on her left-hand ring finger. The media rollout for their marriage was equally nonexistent, with Zendaya's stylist, Law Roach, spilling the beans. Holland then confirmed the news to Esquire, gingerly and succinctly. When and where did they tie the knot? Who was invited? What did Zendaya wear? With this anti-PR power couple, we may never know (though AI-generated photos of the wedding went viral).