Selena, Lilly and Grace are three sorority sisters of Alpha Delta Pi at Brown University in "Meg Goes to College".
When Meg looks to joining a sorority, she is aware that Alpha Delta Pi has a reputation for throwing the best parties. When they open the doors for her, she finds the room is packed wall-to-wall with other sorority sisters who are singing and chanting, as well as a terrified Peter who decided to stay on campus himself and warns her to stay away because they refuse to release him.