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Graham, 52, uploaded three images from her trip, which showcased her in a black bikini.
The last image she posted was with her friend, Aisling Chin-Yee, who posted her own set of images to Instagram.
The “Austin Powers” star kept her caption short, with a simple “#hotsprings”.
The longtime actress recently starred in “The Last Son,” which was released in December 2021.
Graham starred in “The Last Son” alongside Megan Fox’s musician flame, Machine Gun Kelly, and Graham is already onto her next project, a psychological horror film titled “Oracle,” which is filmed in New Orleans.
The “Boogie Nights” star is often praised on social media for her ageless physique. In 2013, Graham gave Women’s Health magazine a sneak peek into her healthy lifestyle.
At the time, the outlet reported she was sugar-free for five years, did yoga three times a week, and took on 20 minutes of transcendental meditation daily.
Fox News’ Julius Young contributed to this report.