The 27-year-old, who has risen to fame through her roles in Euphoria and The White Lotus, partnered with soap company Dr Squatch to create a limited-edition bar of soap called Bathwater Bliss — a concept that arose after followers began requesting her bathwater samples.
Speaking in a press release, Sweeney said, "When your fans begin asking for your bathwater, you can either ignore it, or make it a bar of Dr Squatch soap."
Sydney's first work with Dr Squatch was on a commercial for the brand's Natural Body Wash, with Sydney relaxing in a bubble bath.
The business has since taken the bubbly extract from that photo shoot and created a special new product.
The Bathwater Bliss soap includes exfoliating sand and pine bark extract, with just a hint of Sydney's bathwater.
In Dr Squatch's words, the scent "captures two of the world's best spots: the great outdoors and Sydney Sweeney's tub."
Sydney, who recently came out as single, said: "It's strange in the best way, and I adore that we made something which isn't just not forgettable, but actually smells amazing and performs like all other Dr Squatch products that I adore.".
"Hopefully this encourages guys to wake up to the realities of mainstream personal care products and encourages them to go natural."
The Bathwater Bliss bar will be made in a limited amount of 5,000 units and will be sold only while supplies last.
Social media fans reacted with a combination of amazement and enthusiasm.
One posted, "What has the world come to?"
Another said with humor, "The gooners are gonna blow their life savings getting as many as they can."
A third commenter said, "Never thought I'd see the day that washing my mouth out with soap wasn't a punishment but I actually want to but here we are."
And another asked, "Are straight men ok?"
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