Gwen Stefani will coach 'The Voice' Season 7, but Christina Aguilera will return
Pharrell and Stefani will perform his new single "Come Get It Bae" and her hit "Hollaback Girl" on the May 5 episode, and their coaching tenure will begin in the fall. The two performed together at Coachella in early April.
Aguilera isn't leaving the show for good, however. The pregnant pop star has confirmed that she will return for Season 8.