[Lauren Conrad] the aspiring fashion designer, who quit the MTV reality show in March, has topped the Children's Book category of the list for the second week in a row with LA Candy.
Speaking to People, she said: "If someone said to me five years ago when this all started that I would one day make the New York Times Best Seller list, I wouldn't have believed it.
"I am so honoured that it is now a reality. It was such a compliment to be included in something with such established names."
Conrad has signed a three-book deal with publishing house HarperCollins to produce a series of novels inspired by her own life.
LA Candy, the first in the franchise, revolves around a young girl who moves to Hollywood and ends up starring in her own reality show.
Read an extract here.