"There are very few musical artists as accomplished and talented as Jewel. Her addition to The Sing-Off judges panel, along with our stellar team of Shawn Stockman and Ben Folds, raises the showmanship of the series up another notch," NBC reality chief Paul Telegdy said.
"The musical credentials of Nick Lachey are extraordinary and his continued contributions to the show as host remain a huge asset."
AddedThe Sing-Off executive producer Mark Burnett, "I am so thrilled to welcome Jewel to our expert musical panel. Jewel is one of America's greatest singer songwriters and is an amazing storyteller. In company with the incredible talent of Ben Folds, Shawn Stockman and Nick Lachey this season of The Sing-Off is sure to be its best yet."
The Sing-Off originally premiered in December 2009 as a five-night event and became a weekly series in 2011.
The series is coming back after having been off the air since its third season concluded in November 2011. NBC had announced The Sing-Off's revival in May when they released their 2013-2014 primetime schedule.
While the winner of The Sing-Off's third season -- a group called Pentatonix -- received $200,000 and a Sony Music recording contract, the winner of the upcoming holiday strip will only receive $100,000 in addition to a recording contract with an undisclosed label.
The Sing-Off is being produced by One Three Media, Outlaw Entertainment and Sony Pictures Television with Burnett, Deb Newmyer, Sam Weisman, and Jane Mun serving as executive producers.