Princess Eugenie is mourning the loss of her “special friend,” actor Michelle Trachtenberg. The royal posted a moving tribute to the late actor on her Instagram Story this week. Trachtenberg, 39, was confirmed dead on Wednesday after her mother discovered her in her New York City apartment.

Since Gossip Girl and Buffy the Vampire Slayer actress Michelle Trachtenberg’s death was announced earlier this week, tributes have poured in from well-known faces across Hollywood and beyond. And now Princess Eugenie has posted a touching, personal tribute, using her social media account to remember the actress who was her good friend.

Michelle Trachtenberg’s former costars are paying tribute to her in the wake of her sudden passing. Trachtenberg has died at 39 years old, Deadline reported today. The New York Police Department responded to a 911 call on Wednesday morning,

Time passes. You take for granted you get the chance to see an old friend. To paraphrase, the real tragedies in life are the ones that blindside you on an idle Tuesday,” Lively wrote

News of Michelle Trachtenberg's death prompted tributes from her friends and former "Buffy," "Harriet the Spy," and "Gossip Girl" costars.