It's all about that waist for Meghan Trainor.

When ET's Katie Krause caught up with her at 102.7 KIISM’s Wango Tango in Carson, California, on Saturday, the 22-year-old singer addressed the controversy surrounding digital alterations to her body in the music video for her latest single, "Me Too."

"I was so embarrassed," Trainor admitted. "I thought [fans] would attack me: 'She's Photoshopping! She can't be doing that!' [But] they were just rooting me on. Everyone was so kind."

WATCH: Meghan Trainor Admits She Approved Photoshopped Music Video: 'I Take Full Blame'

The body-positive singer attracted some criticism last week when it was revealed that her waist had been digitally altered to appear thinner in the video. Though Trainor signed off on the video, she said she had overlooked the alterations. Once discovered, she had the video pulled and replaced with a version that didn't change her proportions.

"For me, I was like 'Man, I wear enough Spanx. I don’t need to be cut in half,'" the Grammy-winner said. "It's just not who I am. I don't want to promote that, even if it means take down the video and shock the world for a minute."

That wasn't Trainor's only shock this week. On Thursday, she took a tumble at the end of her performance of "Me Too" on "The Tonight Show starring Jimmy Fallon." Despite a do-over and the opportunity to edit out the fall, Trainor decided to keep the misstep in the final edit. "I sat there and saw both performances… the first one just had so much energy," she told ET. "I said, 'You know what, it goes with the lyrics. It's fine. Keep the fall.'"