Marlene Lawston (born January 1 , 1998 ) is an American child actress . Her acting debut was in the 2005 movie Flightplan , where she played Julia, the six year old daughter of Jodie Foster who was kidnapped on board a plane. In 2006 she played Julie Grant in the Law & Order episode "Thinking Makes It So." She was last seen in the 2007 movie Dan in Real Life where she played Steve Carell's daughter Lilly Burns.