From Wikipedia, the free encyclopedia. Michelle Christine Trachtenberg (born October 11, 1985) is an American television and film actress. She is 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), and in the films Harriet the Spy (1996); Inspector Gadget (1999); EuroTrip (2004); Ice Princess (2005); Black Christmas (2006) and 17 Again (2009). Description above from the Wikipedia article Michelle Trachtenberg, licensed under CC-BY-SA, full list of contributors on Wikipedia