"All About That Bass"? Meghan Trainor's all about that "Mistletoe" in her latest cover.

In a new live performance, the rising pop star takes on Justin Bieber's holiday hit from 2011 and puts an acoustic, ukulele spin on it. With just simple strums backing her twangy coos, Trainor delivers a lovely rendition of the track which, at one point, mashes in Jason Mraz's "I'm Yours"—another ukulele jam.

The cover got the Bieber stamp of approval when the singer told Meggie she did a "nice job" on Twitter, leading his 57 million followers to check out the video too.

It isn't the first time Bieber's shown a little love for the "Lips Are Movin" star. In October, Bieber hopped on a hip hop remix to her breakout smash "All About That Bass."

Meanwhile, "Mistletoe" is the latest festive track from Trainor after she dropped "I'll Be Home," an original heartfelt winter ballad about promising to be home for Christmas.