The model, 26, was seen lying down naked on a deck chair, wearing nothing but a green cap.
WATCH THE VIDEO ABOVE: Kendall Jenner goes viral for awkward kitchen moment
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Jenner’s bikini could be seen lying on the chair beside her as she stared down at her phone.
Her nipple was the only thing covered by a black rectangle.
Along with the picture, Jenner shared a series of random images including a selection of sushi and a mid-air shot of her riding a horse over a jump.
Despite the five very different images, fans only seemed to concentrate on the first - suggesting it had a secret message.
“Single energy LMAO,” one Instagram user said.
“Single Kendall is a big mood,” a second comment said.
“She said I’m singleeee,” said another.
However, not all fans praised Jenner’s post.
“Cover up young lady, you must not be naked to show that you are beautiful,” one said.
‘Single energy’
Another said: “Just because you’re famous doesn’t mean you should have no morals for the privacy of your body smfh.”
Meanwhile, others told Jenner’s ex Brooker, 25, to “stay strong” after seeing the post.
Reportedly the couple - who went public in June 2020 - “are not on the same page” after having a discussion about their future together, a source told Entertainment Tonight.
“Kendall feels like they’re on different paths,” the source said of the celebrity entrepreneur and the Phoenix Suns’ basketball star.
The couple kept a relatively low profile - in Kardashian terms, at least - but Jenner gave her social media followers the occasional insight into their relationship, via Instagram.
The pair was spotted at Kourtney Kardashian and Travis Barker’s wedding in Italy in May and had previously headed out on double dates with Justin and Hailey Bieber.
Jenner was also frequently spotted courtside watching Booker’s basketball games.
But it seems the romance is over - for now.
The source told Entertainment Tonight that Jenner was open to the possibility of a reconciliation down the track.
As recently as January this year, an insider had told the same publication the pair was “in a really great space”.
“They get along so seamlessly and have really fallen hard for one another,” the source said.
“They love that they can genuinely be themselves around each other.
“It takes no effort and things are easy. They both love that.
“Kendall’s family loves Devin and think he is super talented. They think he is just the type of guy Kendall needs.
“He is athletic, sweet, fun, and still a gentleman.”
Eagle-eyed fans had noted something was possibly amiss when neither Jenner nor Booker noted their two-year relationship anniversary on social media.
Last week, the rumour mill went into overdrive when Jenner shared a photograph to her Instagram Stories of herself having dinner with 30-year-old model Fai Khadra.
Khadra has regularly popped up on the Kardashians’ social media platforms and has been part of their social circle for a while.
The Palestinian model has frequently been photographed hanging out with the Biebers as well as model sisters Bella and Gigi Hadid.
Earlier this month, Jenner was photographed in Malibu having a “beach day” with the male model.
Jenner was wearing a tiny purple bikini top and white shorts as she walked her puppy Pyro with Khadra.
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