Please rotate your screen to portrait for optimal viewing experience

Emma Watson's 27th birthday is Saturday. Here's why her impact transcends 'Harry Potter.'by Chris Serico and Colleen Brennan

WATCH | Celebrating her 27th birthday on April 15th, Emma Watson has become so much more than the actor who played Hermione Granger in the "Harry Potter" film franchise.

As a U.N. Goodwill Ambassador, the Paris native has advocated for "HeForShe", which encourages men to fight for gender equality worldwide. Her related 2014 U.N. speech was so influential, it convinced Malala Yousafzai, a co-recipient of the 2014 Nobel Peace Prize, to identify as a feminist.

A self-proclaimed "book ninja", Watson launched the feminist book club "Our Shared Shelf", which has more than 187,000 members on Goodreads.

At various landmarks, she also places related literature for fans to find and pass along.

Watson's worldview extends to fashion, too

She's collaborated with People Tree, whose mission is to pioneer "ethical and environmentally sustainable fashion."

And this year, Watson's spinoff Instagram account, The Press Tour, has documented similarly earth-positive ensembles she's worn while promoting the 2017 reboot of "Beauty and the Beast."

Watson's own sartorial game is 100, as evidenced by her 2011 Elle Style Icon Award and regular inclusion on best-dressed lists in fashion mags and pop-culture websites.

WATCH | Watson has a competitive streak: At Brown University, she played field hockey before graduating in 2014. (She's not the only Hollywood star to play college sports, either.)

Watson hasn't forgotten her roots, either. She recently told Entertainment Tonight she still has group-text chats with her "Harry Potter" cast mates.

She'll put her star power to the test again April 28, when her next film, "The Circle," opens nationwide.

How much do you know about Disney princesses?
Of course, Disney princesses go way beyond Watson's portrayal of Belle in "Beauty and the Beast." How well do you know them all?