In a lengthy story, Blake Lively took to Instagram to mourn her Gossip Girl co-star Michelle Trachtenberg. Lively and Trachtenberg played enemies Serena van Der Woodsen and Georgina Sparks on the show. The actress sadly passed away on 26 February at the age of 39. Actors from Buffy the Vampire Slayer, Gossip Girl, and Trachtenberg’s […]