Acclaimed singer-songwriter Jewel will serve as a judge on the fourth season of NBC's musical competition series "The Sing-Off."

The three-time Grammy Award nominee has enjoyed career longevity rare among her generation of artists. Whether alone with her guitar or fronting a band of ace musicians, Jewel has always been a charismatic live performer, earning the respect of other singer-songwriters such as Merle Haggard, Bob Dylan and Neil Young, who not only invited her to open their shows but mentored her in the early phases of her career.

She has had a prolific career, releasing 12 studio albums. Her first disc, "Pieces of You," was released in 1995 and was wildly successful. With sales at 12 million, "Pieces of You" is one of the best-selling debut albums of all time.

In 2013, Jewel released "Greatest Hits." The album features a collection of her best-known songs as well as two new duets with Kelly Clarkson and the Pistol Annies in addition to a fresh track, "Two Hearts Breaking."

In December, she will release a new holiday album, "Let It Snow," which will feature Jewel's version on 10 classic holiday favorites. On the album she will also debut two original songs, "Blue Crystal Glow" and "It's Christmastime."

As an actress, Jewel starred as June Carter Cash in the Lifetime biopic "Ring of Fire," which earned four Emmy nominations.

Philanthropy remains important to Jewel, and she founded Project Clean Water in 1997. She has been relentless in her efforts to bring safe water to those in need and to create awareness of clean water shortages around the world.

Jewel currently lives on a working ranch in Stephenville, Texas, with her husband, world champion bull-riding superstar Ty Murray, and their baby, Kase Townes Murray.