Lively also wrote about the "painful" film industry in her heartfelt tribute to her former costar Blake Lively is encouraging others to "hold those you love" close in the wake of her Gossip Girl costar Michelle Trachtenberg's sudden death at age 39 on Feb.

Sarah Michelle Gellar, Taylor Momsen and Blake Lively are among those paying tribute to Michelle Trachtenberg, who died Wednesday. Trachtenberg was found in her New York apartment “unconscious and unresponsive,

Blake Lively paid tribute to her Gossip Girl costar Michelle Trachtenberg. Yesterday, news emerged that the actor had died at age 39. Though her cause of death is still unknown, police sources noted that she recently underwent a liver transplant.