This was released today. The face of the matter is that Hilary Duff (singer, clothing designer, and actress) is writing a YA Book that will be published by Simon and Schuster. The first book will be called Elixir. And it is going to be out in October.
Elixir has been described as
"Duff's Elixir combines the overpowering allure of a dangerous love triangle with thrilling international adventure. Clea Raymond is a talented young photojournalist who has spent her entire life in the spotlight as the daughter of a Washington politician and a renowned surgeon. Haunted by the strange appearance of a mysterious young man in her photographs, Clea travels the globe with her best friends, Rayna and Ben, in a race against time to unravel a centuries-old mystery that could unlock the key to her soulmate's true identity and the secret of her father's disappearance--and ultimately save all their lives."