American Girl Nicki and Isabel Book Authors

Nicki and Isabel's journal authors have been rumored to be Jennifer Roy (for Nicki) and Julia Devilliers (for Isabel). Both authors are twin sisters, who are also both Jewish. They also both wrote the book series about twins, Trading Faces, in the late 2000s and early 2010s, and Julia's book How My Personal Private Diary Became A Bestseller was adapted into a 2006 Disney Channel movie, Read it And Weep. Julia also ghostwrote a chapter book series for Dance Moms star Maddie Ziegler, and Jennifer is most known for her Holocaust novel Yellow Star.