“Vampire Diaries” actress Nina Dobrev, 28, revealed to her fans Monday that she was heartbroken over the death of her beloved 18-year-old cat, Lynx. She wrote a heartfelt tribute to her “best friend,” who’d been a part of her life since she was only 10 years old herself, on Instagram. “To my sweet, sweet angel, As I look back on the last 18 years together, I smile through my tears. You brought me so much joy, love, unlimited cuddles and so many sandpaper kisses,” wrote the Bulgarian-born actress. “My heart hurts, I miss you more than words can explain but I can still feel your presence, energy and light. I know you’re still with me and will always be a part of me, no matter where I go … My longest relationship, my rock, my best friend.” — Read it at E! Online