Audrina Patridge is mourning the loss of her niece, Sadie, who died Tuesday at the age of 15.
“My heart hurts to even write this. My beautiful niece is now in heaven,” the “Hills” star, 37, captioned a 10-slide Instagram tribute highlighting happy memories over the years.
“I know Its [sic] not goodbye forever, but it is the hardest to say goodbye for now,” Patridge went on.
“We will miss you and cherish every single moment we had with you. Rest in peace Say Say!! We love you forever & ever! ✨🤍🙏.”
The post included photos of Sadie growing up, family gatherings, sweet selfies and even a shot of the teen dancing with Patridge at her 2016 wedding to Corey Bohan.
One particularly heartbreaking video showed the reality TV personality, Sadie and Sadie’s mom, Casey Loza, smiling and laughing for the camera.
Neither Patridge nor her sister — who also appeared on “The Hills” and “The Hills: New Beginnings” — revealed the cause of Sadie’s death, but Loza told her own Instagram followers that her daughter’s “story will save countless lives.”
She agreed with Patridge that making the announcement was unbearably painful, explaining, “Writing this was the hardest thing I ever have had to do.”
“Sadie liked to remind me that the first law of thermodynamics aka (Law of Conservation of Energy) works in all spheres of life….. ‘Energy cannot be created or destroyed, it can only be changed from one form to another,’” the grieving mother penned. “Transformation is a better word than death.”
Loza concluded her post, “Rest In Peace you brilliant starseed. You’re with your creator. We will miss you dearly. I love you.”
Sadie had only been 15 for 9 days.
“It feels like the years flew by and we still have so many more adventures to go on!” Loza captioned a clip of her “little clone” blowing out her birthday candles on Feb. 5.
“Youre [sic] so beautiful, kind, smart and funny!! that dryyy af british humor tho,” she gushed. “Im [sic] so proud to be your mom and i cannot wait to see the insane ancient civilization architecture you’re going to construct someday. i love you so so much my sadie raine ❤️.”