Where is she from? The 21-year-old, Nantucket-born started off as a country singer/songwriter until she co-wrote worldwide hit All About That Bass with the intention of giving it to another artist. She said at the time, “Most of these other artists’ A&R teams said they couldn’t do anything with the song because they didn’t have [the right] artist. That was the problem – there weren’t any singers at the time [who fit the song]. Adele was the only one, but she wasn’t rapping and singing sassy songs with swears in them. But I’m down – and now I get all the performing royalties!"

But what do the lyrics to All About That Bass mean? Let her explain in her own words. “It’s like thickness and thin: bass is big and treble is the high, thin stuff. Bass is like booty, but treble isn’t boobs. It’s just a joke about thick and thin. Any body type is beautiful. It’s all about loving what you got and rocking it.”

She’s a musical dynamo and plays the guitar, piano and trumpet. When auditioning for LA Reid (the Epic/Sony records chairman and former US X Factor judge) she played All About That Bass on a ukulele. He told her, ‘ You’re a pop star, and I’m going to sign you and you’re gonna shake your butt.’”

She’s written a song with One Direction's Harry Styles. “ It’s a cute ukulele song,” she said. “It’s about when you date someone, then you break up, and you see them with someone else. But they’re so happy, and you’re like, I’m happy for you, maybe some day in the future if we’re back together, that’d be cool. Maybe some day, when we’re old and grey, we could be in love once more!"

But, despite this, out of all the One Direction boys it’s “the blonde one” she’d date. “ He’s a gentleman, all the other boys walked by and he came up to me and said “I love your song, congrats!”

Despite being number one with All About That Bass in a whopping 58 countries, she claims she’s skint. "I haven't made any money yet. They say I will get a big fat check after nine months, which will be in April so I'm hoping that's right. I haven't been able to make a big purchase yet - but I'm working on it."