The 52-year-old film producer flaunted her astonishingly toned bikini body earlier this afternoon on a beach in Miami.
The Croatian-born, Italian-raised beauty could barely contain her sizable assets in the white halter top, which she paired with bubble-gum pink bottoms embroidered with the phrase 'Diamond Dog.'
Diamond Dogs was a concept album by glam rocker David Bowie released on RCA Records in 1974 - when Rusic was just 14-years-old.
With her blonde hair side-parted and pulled back in a chic ponytail, Rita accessorised her summery beach look with aviator sunglasses and a long silver chain.
The mother-of-two was seen toasting red icy cocktails on a sun-lounger with three friends, including one tattooed hunk wearing a blue speedo. Even while seated, the actress-singer's enviably toned stomach remained flatter than most women half her age.
more pictures after the break...