Scout Willis sat with her back to the camera as posed in green bikini bottoms
Scout also took to her Instagram page recently to show off snaps from a swimwear shoot for the Andie brand.
She wrote with her post: "Truly, to me nothing is sexier than a woman who feels powerfully embodied and totally comfortable in her skin.
"I love @andieswim and the incredible women who make it because behind every suit is the intention to give each woman the opportunity to experience that radiant confidence.
Scout Willis kissed goodbye to her 20s by sharing a topless snap
"This photo and this dynamic suit make me feel so good!' Demi's daughter wrote, alongside a full-length picture of her sporting a black swimming costume."
Scout also shared a snap of her posing in swimwear alongside her mum Demi, 58, older sister Rumer Willis, 32 and younger sister Tallulah Willis, 27.
Demi penned the post: 'Today is the day! SO excited to finally share @andieswim’s new campaign, celebrating togetherness and showing up for the people you love…
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"It was only fitting that I got to share this moment with the people I love most @rumerwillis @scoutlaruewillis @buuski [red heart emoji] Link in bio!"
She also shared a sweet snap of her and her mum as she praised photographer Cass Bird for capturing "the true intimacy" of their family.
Scout is seen looking down as she posed on a red chair while her mum sat on the arm in a red swimsuit as she gazed at the camera.
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