It's no secret that Blake Shelton and Miranda Lambert are big fans of Meghan Trainor.

Miranda Lambert & Blake Shelton Talk Inspirations 

Both country stars have noted their fondness for the young singer's hit All About That Bass, but as it turns out Lambert was a fan of the song before she'd even met Trainor.

Recently CMT revealed that the Somethin' Bad singer first found out about the single through a completely different kind of "trainer".

How Blake Shelton Is 'Drinking' His Way To The Top

"Miranda Lambert heard the song before Meghan [Trainor] even had a record deal because my sister in-law is married to Miranda's personal trainer," Kevin Kadish, who'd written the song with Trainor, explained to CMT. "Miranda heard the song over a year agho and then when it came to the CMA's, she was like, 'Oh. Let's do that song.' So it's kind of full circle."

Lambert was a huge fan of the song from the very beginning and when it was released she made a habit of playing it regularly for her crew.

In 2014 Lambert and Trainor teamed up to perform the sassy single during the Nov. 5  CMA Awards,  much to the delight of fans, friends, and even Lambert's own husband.

"That's a fun one," he said of the single to People back in September. "I literally can't relate to it, but it's just crazy fun."

Lambert recently spent a quiet Christmas with Shelton. She will begin her 2015 Certified Platinum Tour on Jan. 15.

Tags: Blake Shelton Miranda Lambert Music