The Princess Diaries, Volume XI: Royal Wedding is a young adult book in the Princess Diaries series. Written by Meg Cabot, it was released on June 2, 2015 by William Morrow Paperbacks and is the first adult installment of the series. The book takes place 8 years after the previous book.
Princess Mia has graduated from college and runs a Teen Community Center that is named after her late step-father Frank Gianini. Her father, the Prince of Genovia, is embroiled in scandal when he is arrested for racing a car in New York City and later is found to have fathered an illegitimate child named Olivia Grace. Mia's boyfriend Michael proposes to Mia and a wedding is planned.
There are no further books after this one, it is the last in the series. Ignore the above sentence that says it is the "first installment in the series." 435 Pages (paperback)