Aljaz, 32, shared the photograph of the Strictly: It Takes Two host with his 545,000 Instagram followers.
The star bared all in just a skimpy pair of pink bikini bottoms as she emerged from the clear blue ocean with her arms over her chest to protect her modesty.
Janette looked fresh-faced and makeup-free in the pic as she glanced back at the shore.
After five years of marriage, the pair have proved they are still both very much in love.
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Aljaz captioned the photo: “Looking for a mermaid? I found mine…”
While Janette responded: “And I found my shipwreck Prince. Love you.”
This is not the first time the pair have shared an intimate picture online, as Janette previously shared a topless photo of them both holding each other close for Valentine’s Day.
Aljaz announced his exit from Strictly Come Dancing in March, while Janette left the show as a professional dancer the year before to take up her new presenting role.