After 18 years, Nina Dobrev is saying goodbye to her cat Lynx. The actress posted on Instagram about having the greatest friends even in the "darkest of times." She has revealed her cat has passed away and she wrote a heartfelt post to honor her "best friend." She says, "To my sweet sweet angel, As I look back on the last 18 years together, I smile through my tears." Dobrev says her cat's death has been one of the hardest things that she's ever experienced.