Gwen Stefani may fill in for Christina Aguilera as a judge on "The Voice" while the pregnant singer takes a break to give birth to her daughter. Sources told TMZ Stefani will get her own big red chair come June when the seventh season of the singing competition gets started. Aguilera would be about eight or nine months pregnant when the battle rounds of "The Voice" start. Aguilera would return to the show for Season 8. She revealed she was pregnant in February one week after announcing her engagement to Matthew Rutler.