'CMA Country Christmas': Watch Idina Menzel & Jennifer Nettles Slay 'Let It Go'

If you thought Frozen fever was thawing out anytime soon, it's quite the opposite. The drop in temperature around the country has only heated up the year-old movie -- as evidenced by the latest cover of the Disney megahit "Let It Go."

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Frozen belter Idina Menzel crashed CMA Country Christmas -- which was recorded on Nov. 7 and aired Monday night (Dec. 1) on ABC -- and sang "Let It Go" with the night's host, Sugarland's Jennifer Nettles.

While Nettles started out with a bit of "Do You Want to Build a Snowman?," Menzel knew what the crowd really wanted to hear. Not everyone can hit the song's epic high notes, but Nettles stood toe-to-toe with Menzel for the soaring song. See for yourself below:

But Broadway superstar Menzel had more than just Frozen songs under her belt. Earlier in the broadcast, she performed "White Christmas" in a fitting ivory long-sleeved gown, and then returned surrounded by a group of children to sing "Do You Hear What I Hear?"

And she wasn't the night's only special guest: Carrie Underwood was joined by Christian singer Michael W. Smith for a powerful duet, while her CMA Awards co-host Brad Paisley rocked out with Aerosmith's Steven Tyler. The night's other performers included LeAnn Rimes, Hunter Hayes, Little Big Town, Alan Jackson and many more.