On Friday, actress Nina Dobrev expressed her sadness on Instagram. ET Online reports that the she dedicated a long post to her cat, Lynx.The Vampire Diaries alum wrote, "A day doesn't go by that I don't think about my sleeping angel ... Especially on #Internationalcatday." Lynx reportedly died in March, but was with the 28-year-old star for 18 years. In addition to reminiscing about the fun and loving times they shared, Nina also said that her feline friend was the size of a tiny teacup, when she brought him home. She added, "I knew in that moment you were my soulmate."