YWAUS Blog: Billie Eilish has a #1 Album at 17.

This 17-year-old is the first artist born in the 2000s to have a No. 1 album

Credit: CNN

Age ain't nothing but a number. In Billie Eilish's case though, it's a big deal.

The pop singer-songwriter is 17 years old and the first artist born in the 2000s to hit No. 1, thanks to her debut album "When We All Fall Asleep, Where Do We Go?"

She's also the youngest woman to hit No. 1 since 2009 when Demi Lovato debuted with "Here We Go Again" at 16.

Here's a couple of other things you should know about Billie Eilish.

She's the daughter of two actors:

Billie Eilish Pirate Baird O'Connell was born to Maggie Baird and Patrick O'Connell on December 18, 2001 in Los Angeles.

Her mother, Baird, is known for her work on the film "Life Inside Out" and video game "Mass Effect 2," while O'Connell, her father, appeared in the movie "Iron Man"and TV show "The West Wing."

She revealed she has diagnosed Tourette’s syndrome:

Eilish opened up to fans on Instagram about living with Tourette's.

"I would love to get this straight so everyone can stop acting goofy..," she wrote on her story. "I have diagnosed tourettes. I've never mentioned it on the internet because nobody thinks I'm deadass..as well as...the fact that I've just never wanted people to think of tourettes every time they think of me."