Stefani will replace a pregnant Christina Aguilera on the upcoming fall season with a one-season deal. Aguilera is set to return for the following spring season.
NBC declined to comment on Stefani.
Stefani, 44, was first introduced to the world as the lead singer of alternative rock-pop group No Doubt. The group has released six studio albums and has sold more than 33 million albums worldwide. Stefani has also released two solo albums, “Love. Angel. Music. Baby.” in 2004 and 2006’s “The Sweet Escape.”
The singer also founded the clothing line L.A.M.B.
Stefani is married to Bush guitarist and lead singer Gavin Rossdale and they have three children together.