'Princess Diaries 3' News: Know The Anne Hathaway Disney Film Well? These Trivia Might Surprise You!

"Princess Diaries" became an instant hit when it debuted in theaters 15 years ago. The Disney film that launched Anne Hathaway's Hollywood career remains a favorite after all these years.

No doubt, "Princess Diaries" and the sequel, "Princess Diaries 2: Royal Engagement," which came three years after the first, has earned numerous viewing times. A lot of young girls grew up watching the movie that when news surfaced about "Princess Diaries 3" potentially coming soon, eagerness for it did not come as a surprise.

But how well do its fans really know the Anne Hathaway starrer? Here are some interesting facts about "Princess Diaries," which might surprise even the biggest fans:

'Princess Diaries' Was A Family Affair

Filming "Princess Diaries" was a family affair for Anne Hathaway as there were pieces on the set that belonged to her real family. The character she played, Mia Thermopolis, had a photo of her deceased father in her room. It's actually the photo of the actress dad in real life, per Glamour.

Meg Cabot, the author of the "Princess Diaries" book series, wrote the stories based on her real life experience as a student whose mom was dating the teacher. Some of the cast members are related to director Garry Marshall, such as the Queen's personal assistant (Marshall's daughter, Kathleen), a guest at the princess ball (Marshall's wife), and the girls from school who asked for Princess Mia's autograph (Marshall's grandkids, Lily and Charlotte), per Buzzfeed.

The ULTIMATE Princess Diaries Trivia Quizhttps://t.co/FLw5F77s0m pic.twitter.com/TCD8UeLBwu

— Seventeen (@seventeen) February 15, 2015

Being Mia Thermopolis In 'Princess Diaries'

Anne Hathaway had to wear a wig and fake eyebrows to pull off Mia's look before her makeover as a princess. She was also asked to gain weight so that she looks like a regular teenager, per Teen. The "Princess Diaries" star also went out in public made up as Mia Thermopolis and said the experience made her feel so alone, per BBC.

Other actresses were considered to play Mia Thermopolis before Anne Hathaway snagged the part in "Princess Diaries." These included Reese Witherspoon and Kirsten Dunst. Liv Tyler almost won the role. Marshall's granddaughters convinced them to go with Anne Hathaway because of her gorgeous princess hair.