Role in the film
Katie first appears in the classroom, in The Georgetown Academy on the first day of school, then right beside her is Luke. She falls in love with him as does he to her too. At one point, she asks him if he would like to join her and her friends to go to the movies, which Luke admits that he cannot because needs permission from his parents, who are away, to leave the White House. Later, she invites him to her birthday party at an ice skating rink, though she doubts that he will come because of the same reason. Luke secretly goes to the party in disguise, but while there, several kids mess around with Luke's protector Sam Simms, who is disguised as a mascot, causing him to skid into a wall and topple over Katie's birthday cake.
Soon, with help from Simms, Luke asks Katie out to the school dance, which she accepts. On that night, both dance, which Luke gets help from Simms on how to dance by dancing with Luke's teacher. However, Luke soon gets found out by the White House, and gets taken back, while Katie allows him to call her sometime.