The new photos have many hoping that they are back together.
While the two share a five-year-old daughter, Lea De Seine, and successfully co-parent her, they haven't been together romantically since 2019.
One photo in the group shows Shayk leaning her head against Cooper's shoulder as he grins at the camera.
There's also a picture of Shayk lying on the beach in the middle of a big heart, as well as a short video of a few tiny pigs walking on the sand.
The Instagram post got a lot of appreciation, with fellow model Stella Maxwell adding a fire emoji, and celebrity hairstylist Harry Josh commenting four red hearts.
Fans of the model and her ex shared their hopes that this might signify a reunion.
One wrote, "Yess they are back 😍," while another said, "Is it Bradley Cooper? Or just wishful thinking? Wishing you happiness ❤️."
Shayk and Cooper first started dating in 2015, keeping their romance rather quiet.
In late 2016, Shayk revealed her pregnancy, and their daughter was born in March of the next year.
The two stayed together for a few more years until they split in 2019, but they continue to work together to parent their child.
An insider told Us Weekly in 2021, "They are on healthy terms and are very respectful of one another, making the coparenting process much more seamless and smooth. At this point in time, they are better off as friends."
Since their split, Shayk has been linked to Vito Schnabel and Kanye West.
Meanwhile, Cooper reportedly dated Dianna Agron after his breakup with Shayk, and he was recently connected with Huma Abedin, as reported by Page Six, but nothing had been officially confirmed between the two.