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.

The pair had reportedly been friends since meeting in the early 2010s in NYC, with the royal sharing a framed photo of the two along with a touching tribute.