Rumer Willis Flaunts Her Assets in Bikini Photos With Sister Scout for a Special Occasion

Rumer Willis wasn't afraid to flaunt her assets in new bikini photos with her sister, Scout.

On Saturday, July 20, Rumer took to Instagram with a carousel of snaps from a day on the river celebrating Scout turning 33.

"River Monsters for @scoutlaruewillis birthday," the elder Willis sister, 35, captioned her update. "No place I would rather be than by your side. My leg bruise is courtesy of my first time trick riding on a horse woohoo."

In the main video, Scout relaxed while soaking in the sun on a floating mat in the water. The birthday girl wore a yellow string bikini in the clip.

The next picture showed Rumer facing away from the camera while wearing a yellow swimsuit—and flaunting most of her backside in the process.

For the third snap, their mom, Demi Moore, donned a white bikini while helping her granddaughter (Rumer's daughter), Louetta, 1, walk on a dock. Still other shots showed Scout and Rumer laughing while sitting on the floating pad and Rumer sunbathing while wearing a pink bikini.

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In the comments, Instagram users reacted to the photos—and one even complimented Rumer on her backside.

"Now from one mum to another 💕that’s a beautiful bum babe💜," one wrote.

"Gaggle of gorgeous humans 😍," another fan declared, as many more wished Scout a happy birthday.

Someone else couldn't get over Moore being a grandmother, commenting, "How the F…. Does anyone have a Grandma like Demi Moore?! I die!❤️❤️."

Speaking of Moore, the actress took to her own Instagram grid with a birthday shoutout for her middle daughter.

"My sweet angel @scoutlaruewillis. Happy Happy Birthday!" she wrote. "I am so privileged to be your mother and so grateful to be sharing this journey of life with you! The best is yet to come and I am so excited to see the magic that unfolds for you! I love you!"

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In addition to Rumer and Scout, Moore and her ex-husband, Bruce Willis, share another daughter, Tallulah, 30.

Next: Rumer Willis Shares New Pictures of Her Daughter "Tiny Lou" That Fans Say Are 'the Sweetest Thing'