Lively remembered Trachtenberg as someone who "laughed the fullest at someone's joke" and "faced authority head on when she felt something was wrong."

Blake Lively broke her social media silence on Wednesday to pay tribute to her late “Gossip Girl” co-star Michelle Trachtenberg, who died Wednesday morning at 39. In an Instagram Story, Lively remembered Trachtenberg as a “fiercly loyal” and “kind person, through and through.”

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.”