In case you had any doubts, Katie Cassidy looks damn good in a bikini. On Friday, the Arrow star hit the beach in Miami, where she put her svelte physique on display. Wearing a string bikini, Katie gave beachgoers a peek at her toned tummy as she waded in the water and walked along the sand. This is just the latest we've seen of Katie in recent months, though she's no stranger to the Miami heat. Take a look at the hottest bikini moments of 2016 — so far!