Award-winning singer Gwen Stefani may become a judge on The Voice to replace Christina Aguilera, according to reports. The NBC show already briefly hired Shakira to sit in for Aguilera who is taking a break due to being pregnant with her second child. Judges Adam Levine and Blake Sheldon remain on the panel as Pharrell Williams takes over from Cee Lo Green. The show is known for bringing renowned singers on to the show as guest mentors, this has included musicians such as Jill Scott, Chris Martin from Coldplay, Miranda Lambert and Aloe Blacc. Filming for The Voice will commence in June, airing on NBC on Mondays and Tuesdays at 8pm.