The 55-year-old wears a black string bikini in the video – which she shared with her 2.7 million followers on the social media platform – and somehow manages to look as effortlessly cool as she does youthful.
In the implausible footage, the ‘Friends’ star appears to leap out of a swimming pool totally dry, before her black chiffon wrap flies on behind her.
The clever effect is likely thanks to Rewind, a function on Instagram Stories which takes a burst of photographs and then stitches them together backwards.
Cox jokingly credits R&B star Missy Elliott in the caption, writing: “Now I finally get what @missymisdemeanorelliott meant by put your thing down, flip it, and reverse it.”
The video, posted just four hours ago at time of writing, has totalled almost a million views already – and the response is overwhelmingly positive from her followers.
“This is epic,” wrote ‘The Big Bang Theory’ actor Kaley Cuoco, while actor and talk show host Busy Philipps wrote, “This is great.”
“This might be the best thing I’ve ever seen” wrote another user, while Erin Foster, head of creative at Bumble, wrote: “I don’t know what’s cooler, this video or how good your body looks.”
Another wrote: “I should put down my phone now, 5:55 am and I just saw the best thing of the day. I love this woman”
Last month, Cox shared a picture with her followers after her daughter Coco Arquette recycled a dress she wore 21 years ago.
She also posted a nostalgic throwback photograph of herself with ‘Friends’ co-stars back in 1994, before the hit show aired. Cox remains close to the several members of the cast, even celebrating her 55th birthday with Jennifer Aniston, 50, and Lisa Kudrow, 55.