Selma Blair leads tributes to Hayden Panettiere.

On Sunday, the Nashville actress's father, Skip Panettiere, announced that his daughter had passed away at the age of 36. The cause of death wasn't disclosed. A short time later, Selma Blair expressed her disbelief over the tragic news on Hayden's final Instagram post. "I love you. Don't be gone. Don't be gone. Please. Please. I love you whale tail my friend. I'm dying. Please be here," the Legally Blonde actress wrote. In addition, Hayden's Scream co-stars remembered her on social media, with Melissa Barrera writing, "Rest in peace sweet Hayden,” and David Arquette commenting, "I love you Hayden."