SI Swimsuit 2015: Behind the scenes in Kauai

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Irina Shayk and Yu Tsai

Irina Shayk

Emily Ratajkowski

Emily DiDonato

Irina Shayk

Emily Ratajkowski

Emily Ratajkowski

Emily Ratajkowski with Yu Tsai and the crew

Yu Tsai and Emily Ratajkowski

Yu Tsai

Emily DiDonato with makeup artist Allan Avendaño

Emily DiDonato

Birthday girl Gigi Hadid

Gigi Hadid with video production team Robb Riley and Julie Deichman, and hair stylist John Ruggiero

Gigi Hadid and a set-crasher

The crew with Hailey Clauson