Kenan Thompson is mourning the death of his fellow Nickelodeon child star Michelle Trachtenberg. "Our first Nick movie star has departed us!!" Thompson, 46, wrote via Instagram shortly after news of Trachtenberg's death at age 39 broke Wednesday,

Blake Lively, Sarah Michelle Gellar, David Boreanaz, Ed Westwick, Kim Cattrall, Kenan Thompson, Melissa Joan Hart and more shared tributes to Trachtenberg.

Comedian and former Nickelodeon child star Kenan Thompson shared a video on Instagram of the two of them on Nick, writing: “Our first Nick movie star has departed us!! She was my friend and now she rests!!” One of Trachtenberg’s first roles was in the Nick series “The Adventures of Pete & Pete.”

Michelle Trachtenberg’s producing partner, Casey Tebo, shared his final conversation with the “Gossip Girl” star before her shocking death. Trachtenberg passed away on Feb. 26 at the age of 39, as The Post exclusively revealed.

Michelle was thrown a lot of curveballs with her health, but she did her best not to let it get her down,” Michelle Trachtenberg's friend said

Michelle Trachtenberg, beloved for her roles in 'Gossip Girl' and 'Ice Princess,' faced numerous health challenges before her untimely death at 39

The death of Michelle Trachtenberg one week ago was definitely a shock, and tributes to the late actress have ben rolling in from the Buffy cast and more. While her passing was a surprise, Trachtenberg’s friends recently opened up about the health issues she'd be not-so-privately dealing with.

Michelle Trachtenberg was found unconscious and unresponsive at her midtown NYC apartment by her mom, Lana. She was just 39 years old. "It is with great sadness to confirm that Michelle Trachtenberg has passed away,