Meghan Trainor's 'All About That Bass' Reaches No. 1 on Billboard-Bye, Taylor Swift!

The 20-year-old climbs the Billboard ranks with her hit single.

It's "all about that bass!"

Meghan Trainor officially reached the top of Billboard's Hot 100 with "All About That Bass."

Now that her single has officially number one on the charts, this makes her the second female artist this year to do so with a debut song. The other would be Iggy Azalea with her song of the summer "Fancy."

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The 20-year-old's hit song knocks out Taylor's Swift's "Shake It Off," the number one song for the past two weeks.

In a recent interview with ET's Rocsi Diaz, Meghan opened up about the body image message of her single.

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She said, "I'm glad a lot of the comments I've gotten are about [girls'] eating disorders and how my song saved them – which is crazy, but amazing."

But with its awesome message and catchy beat, we have to wonder, will it stay on top of the charts?

Well, New York Z100's Elvis Duran told us, "It's more of a novelty song. It's more fun therefore those songs typically don't last as long. But what it's doing is getting everyone's attention. Everyone's going, 'Oh, Meghan. What else can she do?' So what she follows up with is very, very important. This is the gateway drug for Meghan."

See what else the influential DJ has to say about the singer-writer in the video below.