The Princess Diaries is a Young Adult book series by Meg Cabot following the exploits of Amelia "Mia" Thermopolis, a teenager who goes to Albert Einstein High School and lives with her strongly liberal single mom. Her life changes drastically when her father comes for a visit. After being treated for testicular cancer, he is no longer able to have children. Because of this, he finally tells Mia a secret he, her mother, and her grandmother ("Grandmere") have been keeping from her for years: he is really the Prince of the fictional country of Genovia. Because of his illness and treatment, Mia is now Her Royal Highness of the country and the heir to the throne of Genovia.Upon first hearing the news, Mia objects to the idea of having to become a princess and having to rule over Genovia. She also fears that this new status will make her an outcast at her school and would rather just be a normal teenager. The series follows Mia as she slowly adjusts to becoming a Princess and coming to terms with the idea of being a ruler.In 2001, the first book was adapted into a movie starring Anne Hathaway and Julie Andrews. It was followed by a sequel in 2004, The Princess Diaries 2: Royal Engagement. Both movies have a large number of changes from the novels, with the second not resembling any plot point of any of the books with the exception of Mia's mother marrying her teacher and having a baby with him.
Adaptation Decay: The movies are referenced humorously as In-Universe examples. Almost every time they come up in the books, Mia makes a snide remark. She has little problem with the first movie, aside from how they portray her grandmother and how they kill her dad. The second film is the one she critiques for the decay (Meg Cabot has said that she liked the first film and hated the sequel).
Blatant Lies: Lana's election speech in Book 6 is full of these- in essence, she tells the crowd that she'll get them exactly what they want, despite the fact that, as Mia knows, it'd be impossible to get it (and in some cases, getting it would be totally unfair on others).
Lana and Trish consider her pretty smart but she spends a lot of time with Teen Geniuses Lilly and Michael which gives her a very high standard of intelligence. She is not very good at math and science, but is very good at English and speaks seemingly fluent French at times.
Brick Joke: Mia's boyfriend suggests going bowling instead of going to prom. Years later, there is a reference to spending the night at an "all night bowling alley." Doubles as an unusual euphemism.
Changeling Fantasy: Mia discovers that she's the princess of Genovia. Deconstructed, as it turns out to be a lot less fun than one might expect.
Character Overlap: One of the novels has Mia reference Sam from All-American Girl and Jess from 1-800-Where-R-U, two of Meg Cabot's other works.
Chekhov's Gunman: The Guy Who Hates It When They Put Corn In The Chili, JP Reynolds-Abernathy the Fourth ends up becoming Mia's boyfriend after she and Michael break up in the eighth book.
Cloud Cuckoolander: Tina is this sometimes. Mia comments several times that she "wonders what it's like in Tinaland. Everything must be very shiny there."
Comic Book Time: Subverted. The series takes place over four years, as Mia attends high school but the release of the books took around ten years (the first one was published in 2000, the last in early 2009). Despite the use of Comic Book Time, the books use heavy pop culture references and specific dates so it's pretty clear what year the book is set.
Consummate Liar: Mia. Although other characters eventually work out she has the tell of her nostrils flaring when she lies. JP counts too.
Glamorous Single Mother: Subverted with Helen. On one hand she's a gorgeous, successful artist with a nice artist loft in Manhattan with an active social life. On the other hand she can only afford her home and Mia's school because Philippe pays for it all and Mia's childhood was full of moments of her mom messing up, like their power being cut off.
He Is Not My Boyfriend: JP. Mia doesn't want to date him because she just broke up with her long-time boyfriend. An article in the New York Post saying they should get together because they're both "so tall and blond" doesn't exactly help. Also, everyone thinks he's the perfect guy for her.
And a year and a half when she dating him Michael comes back from Japan. Mia still has feelings for him. Tina can tell, and constantly pesters her about it.
Heroic BSOD: Mia spends book 9 trying to pull herself out of clinical depression.
Ivy League For Everyone: Somewhat justified, as the series takes place at an upper class private school in New York.
And even then most don't get their first choice college and as Lana points out she (and perhaps some other students) have parents who are legacies.
In the election debate in book 6, Lana promises to get everyone into Ivy League schools if they elect her. Part of Mia's reaction and response is pointing out that nobody is guaranteed entrance to an Ivy League school, even if they had parents who went there.
Mia herself manages to be accepted to every Ivy League school. However, it is very obvious that she was only accepted because she is a Princess and a celebrity. This greatly disappoints Mia and she ends up not going to any of them as a result, preferring to go to Sarah Lawrence.
Love Triangle: Many, the main ones being Michael/Mia/JP, Mia/JP/Lilly, Lilly/Boris/Tina. Some more minor ones are Michael/Mia/Kenny, Mia/Michael/Judith, Boris/Lilly/Hank, Boris/Lilly/Jangbu, Mia/Josh/Lana.
The Makeover: Subverted in that Mia thinks her makeover makes her look worse, and after a while she goes back to looking like she normally does ("like a blonde Q-tip") and her looks aren't brought up very often after that.
Nice Girl: Mia is this most of the time. Also Tina.
Noodle Incident: "I will apologize to the Genovian olive growers about that thing with the pits."
The Nose Knows: Mia frequently comments that she loves the smell of Michael's neck. In the last book, she realizes that there's a scientific explanation for it during her psychology exam.
Numbered Sequels - The UK versions of series have fun with this; the sequels are called The Princess Diaries: Take Two, The Princess Diaries: Third Time Lucky, The Princess Diaries: Mia Goes Fourth, The Princess Diaries: Give Me Five, The Princess Diaries: Sixsational, The Princess Diaries: Seventh Heaven, The Princess Diaries: After Eight, The Princess Diaries: To the Nines and The Princess Diaries: Ten Out of Ten.
Oblivious to Love: Mia. If you want to let her know about your romantic intentions, do not be subtle about it. Just straight up tell her or she will never realize it. Before they got together she thought Michael tutored her in algebra (daily) because she was Lilly's friend, that he asked about what she did on the weekend so they could do more algebra, that his song about her was just 'some guy' who liked 'a girl' and wandered about shirtless by accident. Yeah...
Also Gender Inverted with Mia's dad, as it's actually wondered by one of the other characters why Phillipe bothers to run in the Genovian election, and Mia specifically responds with something similar to this trope.
Preppy Name: Justified as most of the characters are either royalty or are wealthy and actually go to prep school. John Paul Reynolds-Abernathy IV is probably the most egregious example.
Mia herself qualifies; her full name (and title) is Amelia Mignonette Grimaldi Thermopolis Renaldo, Her Royal Highness the Princess of Genovia.
Punny Name: Mia's shrink, Dr. Knutz, which is lampshaded by Mia.
Quirky Curls: Mia started out with them but her make-over flat-ironed them away.
Race for Your Love: Subverted. Mia races to the airport to meet Michael before his plane leaves for Japan. She's too late - his flight has left.
In the last book when Mia's trying to publish the romance novel she wrote many people fuss over the fact it's a romance novel. Never mind that it's 400 pages long, she did tons of research on medieval times, she spent two years working on it, and it's actually one of the hardest genres to write well.
Really Gets Around: Mia's father to the point were it's kind of surprising she's his only kid.
Mia becomes this trope over the course of the series, which is Lampshaded by other characters in Book 10.
Shipper on Deck: Tina tends to ship her friends, especially Mia. Mia's mom and Mr G also seem to ship Mia/Michael. Grandmere however ships Mia/JP. Mia herself ships Boris/Tina in later books though its mostly to protect Boris from Lilly after she cheated on him.
Super OCD: Mia obsesses about many, many things. Played for Laughs and Deconstructed. Her over the top obsessing over things can be funny but causes her a lot of stress that takes its toll on her mental health.
Sympathetic P.O.V.: Some of Mia's actions look a lot less sympathetic once you hear Lana and Lilly's side of the story.
Also we the reader are supposed to view some of Mia's actions and thoughts as ridiculous, like if she and her friends believe they are behaving like intellectuals but are actually behaving like silly teenage girls (for example, Mia and Tina's inability to understand Ms. Martinez liking Pride and Prejudice for reasons other than "how hot Colin Firth looked"). However, since Mia is the one writing it, she doesn't understand how silly this comes across as. In fact this is one of the main sources of humor in the series.
The B Grade: played straight and averted. In book 6 Mia is horrified to get a B in English, her best subject. The B was mainly due to the fact her new English teacher didn't like the essay subject. On the other hand Mia is thrilled to get a B- in algebra.
Twice Shy: A thousand times Mia and Michael. It's implied Michael's had feelings for Mia long before the beginning of the series, and Mia realizes she has a crush on him during the first book. Even though Everyone Can See It and they hang out every day, they take three books to admit they love each other, even dating other people in the middle. To finally clear things up they resort to sending anonymous love letters and replying via a computer program.
Wide-Eyed Idealist: Tina, whenever romance is involved. Subverted a bit when Tina reveals to Mia that she's been sleeping with Boris regularly for about a year or so, but she still has an overly idealistic attitude about love.
Mia can also be like this when romance is involved, as pointed out by her parents.