Stefani will fill a vacancy left by pregnant judge Christina Aguilera, during the reality series' upcoming eighth season, which starts filming in June.
According to TMZ, which first broke the news Friday, producers began searching for Aguilera's replacement after the "Your Body" singer announced her pregnancy back in February. TMZ added that the network wanted Aguilera to stay on during her pregnancy, but the "Fighter" singer has been struggling and opted out of the rotating seat.
Stefani is reportedly signed on for just one season. An NBC rep, when reached for comment earlier this week, told Us, "We haven't made any decisions at this point."
Stefani, meanwhile, enjoyed a fun vegan girls' dinner with pals Gwyneth Paltrow and Nicole Richie on Thursday, April 17. The "Hollaback Girl" singer, who welcomed her third baby boy, Apollo, in February, debuted her amazing body at Coachella last weekend for a surprise performance -- just six weeks after giving birth.
"Feels good to be out of the cave #Coachella2014," the singer tweeted.