Blake Lively's Madewell Swimsuit on Instagram
You Can Get Blake Lively's Extreme-Cutout Swimsuit at Madewell
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Yonique One-Piece Swimsuit ($30)
For a flirty take on Blake Lively's swimsuit style, go with this version from Yonique, available on Amazon. It features cinching at the bra and at the hips, as well as a thong bottom for a little extra flair.