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.

The death of former child star Michelle Trachtenberg has shocked the entertainment world, but some fans of the Harriet The Spy star had been concerned about her well-being prior to her unexpected passing.

Princess Eugenie took to her Instagram Stories on Thursday, Feb. 27, to share her thoughts on the Gossip Girl star. 🎬 SIGN UP for Parade's Daily newsletter to get the latest pop culture news & celebrity interviews delivered right to your inbox 🎬 “Goodbye,

Princess Eugenie is mourning the death of her longtime pal Michelle Trachtenberg. “Goodbye, special friend. You are so loved and missed,” Eugenie, 34, wrote via her Instagram Stories on Thursday,. “Thank you for so many memories of laughter and fun.

Sarah Michelle Gellar is remembering her late friend Shannen Doherty while also mourning the death of Michelle Trachtenberg. Gellar, 47, took to Instagram on Thursday, February 27, to pay tribute to Trachtenberg,

Michelle Trachtenberg's cause of death remains undetermined, but a source reveals she recently had a liver transplant.

Michelle Trachtenberg appeared to be in poor health during one of her final nights out in New York City before her untimely death, sources tell Page Six exclusively. The “Gossip Girl” star was spotted having dinner with friends at Italian eatery Sartiano’s last Thursday, just six days before she was found dead.

The former Nickelodeon star also shared sweet photos of them on set Former Nickelodeon star Danny Tamberelli remembered his The Adventures of Pete & Pete costar Michelle Trachtenberg in an emotional Instagram post.

Following reports of Michelle Trachtenberg's death, the actor's co-stars started posting tributes to her. Here's what they've said.

From Ed Westwick to David Boreanzaz, how the casts of Gossip Girl, Buffy, and more are paying tribute to Michelle Trachtenberg.