The 34-year-old, who is a model, fashion designer, and TV star, enjoyed a day by the sea while wearing a navy bikini, featuring a swan print.
The stars, who have been documenting their holiday on social media, were seen having a picnic in the shade before taking a dip in the water.
Pixie, 27, who was joined by her husband George Barnett, showed off her wild side as she jumped into the sea.
The singer shared a shot of Alexa posing topless on a rock, writing: “Get your rocks off, get your rocks off chungy @alexachung.”
Alexa, who is currently believed to be single, meanwhile posted a picture of Pixie as she enjoyed their pool at their villa.
The former Popworld host has had the same group of friends, including Nick Grimshaw and Pixie , for years and she thinks they are "stuck" with one another.
However she believes that as her pals get married, they start to drift apart from the group.
She told Grazia recently: "I'm bloody stuck with them. We call it 'dorm life', we didn't want it to end."
Asked if things are changing as they get older, she said: "For every wedding you attend, six months after that, it's a goodbye party. Every wedding is a friendship funeral."
The star also revealed she is quite "boyish" but thinks growing up in a male-dominated household has helped her become good at dispatching advice to her pals.
She said: "My boyishness helps me be a better girls' girl.
"I grew up with brothers so I wasn't mystified by men. I've been good at advice."
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