Rumors that the former No Doubt singer would take over for Aguilera began earlier in April. Aguilera seemed to confirm the news herself on Tuesday when she tweeted a welcome to Stefani on Twitter.
"She's friends with the other coaches but has a strong opinion, which is also important," host Carson Daly recently said of Stefani. "They can't all just be too lovey out there. So I think she'd be a solid choice."