"A Global Movement of Positive Energy!"
It has been confirmed: the script for the third movie of the sequel has been written! Meg Cabot, the author of The Princess Diaries book series, reported to Entertainment Weekly that the script exists. She added that if the movie does get made it would be a tribute to Garry Marshall the director of the first two movies who passed away in 2016. Cabot gave no further details other than that the movie would be slightly different from the book series remarking that she thinks of them as "two different universes."