The 82-year-old legendary actress took to Twitter to share the throwback photo with her 136,000 followers.
Proudly flaunting her incredible bikini body and major cleavage, the triangle tasselled top did little to support her ample assets.
Paired with matching leopard-print bottoms with a fringed hem, the Dynasty thespian oozed body confidence and attitude as she posed with one arm on her svelte hip.
Joan accessorised with chunky gold bangles and large hoop earrings, while she smouldered with a smokey eye, lashings of dark mascara and a cherry red lip.
Simply captioning the image "nice bikini", the Dame's fans were quick to comment on the post and gush about her evident good-looks.
One said: "Wow."
Another added: "Wow. Stunning. But then I bet girls half your age today wish they had your good looks, as you still have now."
This time she opted for a red and white checkered two-piece, topped off with a swimming cap and oversized square-shaped sunglasses.
Meanwhile, Joan was in Saint-Tropez filming the second series of her hit E! show The Royals earlier this week.
The mother-of-three plays the Queen Mother with 50-year-old Elizabeth Hurley cast as her daughter, Queen Helena.
Elizabeth captured a shot a cute snapshot which showed the close friendship she had formed Joan.
Dressed in a typically chic monochrome dress with a crisp white blazer slung over the top, Joan placed an arm around a casual Elizabeth clad in jeans and a sparkling gold sweater.
The model wrote: "What a lark shooting with the divine @joancollinsdbe in St Tropez today. Now being spoilt at her sexy villa #TheRoyals."
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