Lizzy Caplan in Erdem at the premiere of Ghostbusters in Hollywood, California, July 2016.

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Who: Lizzy Caplan.

When: Saturday, July 9.

Where: The premiere of Ghostbusters in Hollywood, California.

What: A white Erdem Pre-Fall 2016 gown.

Why: It's not even her movie, but Caplan steals the red carpet out from under Kate McKinnon and co. at the Ghostbusters premiere. This ruffled Erdem dress is clean and crisp; the ruffles are almost twee but Caplan's mod, square bag tones down the cuteness. White may be everywhere come summertime, but it doesn't have to be dull.