In this charming return to Genovia, Mia Thermopolis has grown a little, but she remains the same naïve and somewhat clumsy girl who stole our hearts. Now, as the legitimate princess of the small kingdom, Mia faces a monumental challenge: to comply with the demanding ancient law that states she must marry before her twenty-first birthday in order to officially assume the throne. The pressure is immense, especially with her grandmother, Queen Clarisse, urging her to find a suitable husband.
Amid romantic dilemmas and the search for true love, Nicholas, a handsome distant cousin of Mia, appears. At first glance, they seem to have a special connection, but Mia isn't completely sure whether his intentions are genuine or if he just wants to compete for the throne. To complicate matters, the arrogant and charming Lord Devereaux also enters the mix, presenting himself as the perfect fiancé who could ease Mia's transition into royalty.
As she navigates a world filled with expectations, commitments, and hopes, Mia must also discover what true love and responsibility really mean. With the help of dear friends and amid hilarious situations, the young princess embarks on an adventure that will lead her to make decisions that will change her life forever. Will Mia find her way to the heart of royalty while also staying true to herself in the process?