The actress hung out with her daughters, Tallulah and Scout Willis, on Sunday, where the trio posed poolside in their sexy swimwear.
The "G.I. Jane" star put her impressive physique on full display in a tiny red polka-dot two-piece while her daughters mix and matched their looks, with Tallulah, 21, sporting a white monokini and Scout, 23, choosing a blue bikini.
"When you can't be with the papa.... #freeslw #POOLPARTY #mymomsbodtho," Tallulah captioned the pic.
We agree with Demi's daughter ... we can't believe how HOT the mother-of-three looks!
Rumer Willis was noticeably absent from the photo, but she did post a pic last month where she looked like her mama's twin.
In the photo, the pair looked freakishly similar, wearing matching navy jumpsuits and black-rimmed glasses, both with their long, dark hair in identical styles.
"That moment when you realize you actually are becoming your mother," the "Dancing With the Stars" winner wrote, adding the hashtags "#twinning" and "#imnotmad."
While Rumer clearly wasn't complaining about taking after Demi, she recently opened up about how her mom's beauty negatively affected her as a teenager.
"I compared myself to her. I would go, 'My mom wears smaller jeans than me! Oh, God. Maybe I'm not skinny enough.' Every girl looks up to her mother, but my mom was larger-than-life and I felt I could never be like her," she told Us Magazine. I just didn't feel like we were even the same caliber."
Fortunately, she had her sisters to "lean on" during that difficult time. "They are my best friends," she added.