Rhett is doing so with an original song, Hambrick's inspiration is Stevie Wonder and Dunn has remade Elton John's festive favourite.
The new remix features lush orchestral arrangements based on the star's widely-acclaimed AMAs performance.
Taylor Swift gave a career-spanning performance and became the most awarded artist in American Music Awards’ history, beating Michael Jackson’s record.
The trio will join previously announced performers Shania Twain, Billie Eilish and Artist of the Decade recipient Taylor Swift.
Also due to perform are Selena Gomez, as well as Taylor Swift, recipient of the AMAs Artist of the Decade award.
The pop superstar currently has the most AMA wins of any female artist ever with 23 awards.
Post Malone leads the list with seven nods, with Ariana Grande and first-time nominee Billie Eilish following with six each.
This year's event featured jaw-dropping performance from Underwood, Swift, Cardi B, Panic! At The Disco and more.
This year's fan-voted AMAs will air live on ABC on 9 October from the Microsoft Theater in Los Angeles.
Lady Gaga, Keith Urban, Drake and Imagine Dragons are among the winners at the 2017 American Music Awards ceremony in Los Angeles