They've lit up our screens, dazzled on red carpets, and stolen hearts worldwide — but when it comes to matters of their own hearts, these A-listers chose privacy over the spotlight. While the public eye tends to catch every red carpet moment and Instagram update, some celebrity couples manage to keep their relationships almost entirely out of view. Whether it's a secret wedding, a quiet engagement, or simply years of flying under the radar, here are 16 couples who've kept things quietly committed and rarely seen. Daniel Radcliffe and Erin DarkeIt all started on the set of "Kill Your Darlings" back in 2012, where sparks flew instantly between Radcliffe and Darke. "We met on set and just got on immediately," he said. "It was one of those instant things where you're like, 'Oh, I really lik

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