Selena Gomez

Selena Gomez in Galvan on the first night of her "Revival" Tour in Las Vegas, Nevada, May 2016. Photo by Getty Images.

Who: Selena Gomez.

When: Friday, May 6.

Where: The opening night of her Revival Tour in Las Vegas, Nevada.

What: A silver slip dress by Galvan.

Why: The slip dress is forever, and Galvan does it best. With a daring high slit and plunging neckline, Gomez's Galvan gown is Las Vegas nightclub-perfect, embracing our favorite '90s trend with a metallic glow.

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