If you've heard the song, "All About That Bass," — even if it was Jimmy Fallon's classroom instruments version [1] — chances are you're as obsessed with it as I am. It's the breakout hit from rising star Meghan Trainor, and it just overtook Taylor Swift [2]'s "Shake It Off" as the No. 1 song on Billboard's Hot 100. The throwback beat is super catchy and the lyrics are all about body acceptance and self-empowerment [3]. Trainor is a young up-and-coming singer, and if you're curious about her, here are all the details on the talented budding diva!

• She's new to this. Trainor is only 20 years old, and this is her first single. Though she was signed to a label at 18, she's been primarily a songwriter for other artists.
• L.A. Reid was responsible for getting the track made. In an interview with Billboard, Trainor admitted [4] that though she wrote the song over a year ago, producer L.A. Reid was the first to champion it. Supposedly the mogul — who launched artists like Mariah Carey [5], Avril Lavigne [6], Pink, and Justin Bieber before appearing as a judge on American Idol — fell in love with it after hearing only a demo and signed her to Epic Records.
• Her own body image issues inspired the song. In the same interview, Trainor opened up about her issues with her own body. "I've struggled with it forever," she said. "It's more mental than it is real. I just wish there were songs out there that could have helped me when I was growing up."
• Her new EP has even more songs with powerful messages. The biggest message Trainor wants her audience to hear? "Love yourself more," she said. Title, which came out this week, has more positive songs about women's empowerment, specifically when it comes to relationships. "I didn't have good relationships."
• She's written tracks for Rascal Flatts. Trainor has written songs for several music genres, including pop, country, and reggae. She's also written for Common Kings, Tenelle, Sabrina Carpenter — yeah, the little blond girl from Girl Meets World [7].