Blake Lively is mourning her "fiercely loyal" and "brave" Gossip Girl costar Michelle Trachtenberg after her death at age 39.

Michelle Trachtenberg, star of film and television projects like 'Gossip Girl' and 'EuroTrip,' has died at the age of 39, ...

Blake Lively, Rosie O’Donnell lead tributes to Gossip Girl and Harriet the Spy star - Kim Cattrall, Kenan Thompson and ...

Michelle Trachtenberg's death Wednesday left her former co-stars like Blake Lively, Rosie O'Donnell, Melissa Gilbert and ...

The cast of Buffy have paid tribute to their co-star Michelle Trachtenberg following the news that she had passed away at the ...

Actress Michelle Trachtenberg shot to fame as a child star at age 3, starring as Nona Mecklenberg on the hit Nickelodeon ...

Michelle Trachtenberg's breakthrough performance came with the 1994 TV show The Adventures of Pete & Pete on Nickelodeon ...

Michelle Trachtenberg - who has tragically died at the age of 39 - had a liver transplant just a few months before she passed ...

Melissa Gilbert, who starred with Trachtenberg in A Holiday for Love and lives nearby the actress, also took to Instagram, ...

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Michelle Trachtenberg's cause of death has been announced following her tragic death aged just 39. Known for her memorable ...

Michelle Trachtenberg, an American actor known for her roles in the television series "Buffy the Vampire Slayer" and "Gossip ...