Lizzy Caplan

Lizzy Caplan in Roksanda in New York, New York, May 2016. Photo by Getty Images.

Who: Lizzy Caplan.

When: Thursday, May 26.

Where: Outside The Late Show with Stephen Colbert.

What: A lemon yellow Roksanda Spring 2016 dress with black platform heels.

Why: Yellow was everywhere at Cannes this month, but it's rare to see someone pull it off in the wild. Caplan's bright lip plays off the bold color of her dress, ensuring she's not overpowered by its yellow-ness, and she elevates the ankle-length silhouette with an in-vogue platform heel. Simple, elegant, functional — and so cheery.