5 Things to Know About Brie Larson

Hollywood's new "it girl" beat Cate Blanchett to win a Golden Globe.

— -- If you didn't know who Brie Larson was when she accepted Sunday's Golden Globe for Best Actress in a Drama, you soon will.

But with her starring role in "Room," as a woman held captive with her five-year-old son, Larson is finally coming into her own. And she seems ready and poised to handle the spotlight.

Emotional but composed during her acceptance speech, Larson thanked the usual roundup of folks: the Hollywood Foreign Press Association, the filmmakers, cast and her significant other. But instead of pressing on after the music started to play her off, she apologized to "anyone I forgot" and promised to "write you a thank you card."

So who is Hollywood's new "It Girl?" Here are five things you need to know:

She changed her name

She was born Brianne Sidonie Desaulniers in Sacramento, California. Both her parents worked as chiropractors and separated when she was young. Larson, whose first language was French, later moved to Los Angeles with her mother and younger sister Milaine. "We had a crappy one-room apartment where the bed came out of the wall and we each had three articles of clothing," she told the Guardian. She later chose "Larson" as her stage name after her great-grandmother's maiden name, telling Glamour magazine that her surname was too difficult to pronounce.

She's precocious

She sings

After starring together in "The Spectacular Now," Larson and Shailene Woodley have become close. Larson told GQ in 2014 that Woodley actually saw the real her even before she did. "I think we spend a lot of time trying to be the eagle when we’re the chipmunk. We spend a lot of time trying to be something else, some other illusion, some other idea of what a woman is," Larson explained. "Shai saw me as a beautiful complete person before I was ready to identify that within myself. I felt I needed to come into my own. But instead, I was there all along."

She has a boyfriend

The other person who gets her, as well as shares her passion for music, is boyfriend Alex Greenwald. He's the lead singer of Phantom Planet, the group that did "Californiaaaaa," the theme song of "The O.C." During her acceptance speech, Larson thanked Greenwald, calling him her "love," and he mouthed back the words, "I love you."