Blake Lively took to her Instagram Stories Wednesday evening to share a lengthy tribute to her “Gossip Girl” costar Michelle Trachtenberg. “This is the first day I met Michelle,” Lively wrote, sharing a photo of her and Trachtenberg on “Gossip Girl.

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.”