Michelle Christine Trachtenberg (born October 11, 1985) is an American actress. 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). She also appeared in the films Harriet the Spy (1996), EuroTrip (2004), Ice Princess (2005), the Black Christmas (2006) remake, and 17 Again (2009).