She is best known for her roles as Dawn Summers in the television series Buffy the Vampire Slayer (2000-03) and as Georgina Sparks in Gossip Girl (2008-present). Trachtenberg made her first television appearance at the age of three, in a commercial for Wisk Detergent. She revealed on the December 22, 2006, episode of Late Night With Conan O’Brien that House is her favorite show, she is friends with one of the producers and she asked to be a guest star. in the episode “Weeping Willow”, she played the role of Willow, a kidnapped video blogger based on lonelygirl15. in 2007, she was cast as the female lead in an ABC comedy pilot called The Hill, set in Washington, D.C. Trachtenberg provided the voice of Tika Waylan for Dragonlance: Dragons of Autumn Twilight, a direct-to-video animated movie based on the novel of the same name. in March 2011, she was the featured cover girl in Maxim..
Michelle Trachtenberg Fosters Herself Some Mark Foster! New couple alert!!!!And what a YUMMY new couple it is too…our Kicks are PUMPED! Buffy’s little sister Michelle Trachtenberg was spotted leaving the Troubador Hotel in West Hollywood Tuesday night with Foster The People frontman, Mark Foster!Michelle ALSO tweeted a snapshot of the two together from the Coachella #burton party.We wonder if they’ve been cozying [...] [link]

