Go Backstage with Meghan Trainor at Napa Valley's Live in the Vineyard Fest

What pairs well with any good wine? Live music.

Meghan Trainor is taking ETonline backstage at Live in the Vineyard, where she performed for fans in the gorgeous Napa Valley this past weekend. Also on the bill for the three-day festival were Train, Ingrid Michaelson,Nashville's Jonathan Jackson, Mat Kearney, Echosmith, Matt Nathanson and X Factor alum Bea Miller.

WATCH: This 11-Year-Old's Dance to 'All About That Bass' Will Blow Your Mind!

Go behind the scenes in ETonline's exclusive video above.

The 20-year-old singer-songwriter may not have been old enough to indulge in Napa's signature beverage, but the experience was still an unforgettable one.

"Performing for that crowd was amazing," Meghan gushes, "'cause they sang back every word that I sang, whether it was my song or other songs."

WATCH: Meghan Trainor Bares All - Her Unexpected Big Break, Being Bullied and Embracing Her Body

Meghan recently unveiled her second single, "Lips Are Movin'" after "All About That Bass" spent a record-breaking eight consecutive weeks on top of the Billboard Hot 100 chart – the longest reign for any Epic Records artist. (To date, the body image anthem has spent a total of 17 weeks on the chart.) Tickets are now on sale for her forthcoming That Bass Tour.

Back in September, Meghan opened up to ET about her unexpected big break and inspiration for her hit single. She also debuted the ukulele rendition of "Bass," which has quickly become her go-to version for live performances. Watch below!