Audrina Patridge, known for her role in ‘The Hills,’ is grieving the sudden death of her 15-year-old niece, Sadie Loza. The cause of Sadie’s death has not been disclosed. Born in 2008 to Audrina’s sister Casey Loza and Aaron Hershman, Sadie’s passing has deeply affected her family.

Audrina expressed her sorrow on Instagram, writing, “I know it’s not goodbye forever, but it is the hardest to say goodbye for now. We will miss you and treasure every moment we had with you. Rest in peace!! We will love you forever and ever!”

Celebrities including Brody Jenner, Rachel Bilson, and Paris Hilton offered condolences in the comments. Casey Loza also shared the heartbreaking news on Instagram, struggling to find words for the loss of her daughter.

“Sadie liked to remind me that the first law of thermodynamics… Her story will save many lives. Her memory will live on forever. You brilliant Starseed, rest in peace,” Casey wrote.

Kyle Loza, Sadie’s stepfather, posted a tribute as well, saying, “I’ll keep your memory with me until I see you again… You were my first Love.”

Sadie’s stepfather Kyle, a freestyle motocross rider and musician, married Casey in 2009, a year after Sadie was born. They have two other children together.

Our thoughts are with Audrina Patridge and her family during this difficult time as they mourn Sadie, whose cause of death remains undisclosed.