A firm fan of the festival, the brunette was also in attendance in 2015 and in 2014, long before she met her new Formula 1 driver beau.
Ensuring her curves were on full display, her sexy bikini featured sheer plastic strips across the hips and back.
Jenson Button's girlfriend could be seen facing away from the camera and flicking her long locks in the wind as she celebrated American Independence Day.
You'll be pleased to hear if you're trying to get inspired for summer then Brittny's top is just ÂŁ11 from Forever 21 - bargain! The white bottoms, which were worn low on her hips, highlighted her trim waist and svelte figure as she leaned against an open door.
Motivation: Jenson Button's girlfriend Brittny Ward used her own incredible bikini body as inspiration for her workout on Wednesday Brittny also put on the latest sultry show for her 225,000 Instagram followers after returning from a blow-out at Coachella in Indio, California last month.
But it wasn't just her posterior that was the focus of the shot as she put on a very leggy display due to her towering stilettos.