Admit it. The chorus is stuck in your head right now. And if it's not, it soon will be. Meghan Trainor is quickly becoming the reigning monarch of the pop charts with the hit "All About That Bass." We totally understand if your first instinct is to ask "Who? and "What?" Trainor's moment under the pop culture sun seemingly came out of nowhere this week. But her star power seems to be on the rise, so it's time to catch up. Here's what you need to know about the 20-year-old "Bass" singer:

Where did she come from?

 Trainor had an album in 2011 called "I'll Sing With You," and she wrote songs for people like Rascal Flatts and "Girl Meets World" star Sabrina Carpenter. "All About That Bass" is her first big hit. Her parents own a jewelry store in Nantucket.

She is having the best week ever.

"All About That Bass” earned the top spot on the Billboard Hot 100 after spending some time in second place, knocking off Taylor Swift's "Shake it Off." Trainor also debuted her new album "Title" this week and performed on "The Ellen Degeneres Show."

The song has even gotten the Jimmy Fallon treatment on "The Tonight Show."

Who says Trainor is the new queen of butts? I mean, have you seen Nicki Minaj's "Anaconda" video?

It's true. The sheer force of booty worship in "Anaconda" is light years away from Trainor's body-positive hit. But you can't argue with the charts. Minaj's ode to rumps dropped to the third spot on the Billboard Hot 100 after reaching number two last month, marking her highest Hot 100 rank.

“You know how the bass guitar in a song is like its ‘thickness,’ the ‘bottom’? I kind of related a body to that,” Trainor told Billboard.

Check out Trainor shaking her instrument in "All About That Bass" below: