The Sports Illustrated swimsuit model put her famous figure on display in a tiny two-piece that showed off her flawless physique.
The 23-year-old former "Dancing With the Stars" competitor, who wore her hair up and protected her eyes with a pair of dark shades, rocked a tiny black top and gold bottoms while frolicking through the sand.
McKinney also shared a snapshot of her scantily clad beach day to Instagram, showing her relaxing on the sand, enjoying the warmth of the midday sun.
McKinney, who will next star in the "Baywatch" movie alongside Zac Efron and Dwayne Johnson, first gained nationwide fame when she stripped down for one of the steamiest Carl's Jr. Super Bowl commercials of all time. Check out the video below to see the sultry model's sexy breakthrough TV spot.