Princess in Love is a novel in the Princess Diaries' series by author Meg Cabot. The story follows the main character, Amelia "Mia" Thermopolis, as she finishes her winter term at school and prepare to make her first official visit to Genovia an as a princess.

Mia struggles with juggling her different duties as a royal person, such as her princess lessons with Grandmere, along with the things she wants to do as a regular teenager. One of the biggest issues Mia has to deal with is her grandmother, Grandmere. Grandmere is providing princess lessons to Mia to teach her how to be a proper royal. Grandmere also dispenses some romantic advice on how Mia should handle Michael and other boys in order to win them over.

Mia constantly worries about Michael, but she is also worrying about how to break up without her existing boyfriend, Kenny, without hurting him. Mia also feels very self-conscious about her looks and her abilities when she compares herself to Michael and her other friends. By the end of the novel, Michael and Mia are officially in love.

Right before Mia leaves for Genovia, the brother of her best friend, Lilly, and the boy she has been in love with forever, Michael, kisses her and professes his love for her.