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Sydney Sweeney is finally addressing the age-old question that’s been on everyone’s lips since she burst onto the scene ... and yep, it’s exactly what you think it’s about. 🍒

The actress sat down for Vanity Fair’s lie-detector test while promoting her new flick, "The Housemaid" -- and that’s when costar Amanda Seyfried asked whether her boobs are real or if she’d ever had any work done on 'em.

Sydney didn’t miss a beat -- she said "no" to both questions, adding she hasn’t had work done anywhere ... and the polygraph administrator backed her up, confirming she was telling the truth.

As you know, Sydney’s always been unapologetically body confident ... rocking skintight fits that proudly highlight the girls. Instagram / @sydneysweeney

But she hasn’t always felt that wa

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