'The Voice' Recap: Gwen Stefani, Pharrell Williams Perform for Top 8

Gwen Stefani and Pharrell Perform on The Voice
Trae Patton/NBC

Gwen Stefani and Pharrell perform "Hollaback Girl" on "The Voice" on May 5, 2014.

Two blondes made their debut on "The Voice" on Monday night: Gwen Stefani, and a newly-platinum Adam Levine.

"I don't have an explanation -- I woke up, I had the day off, and I thought I'd look like Shakira," he said of his new 'do. "I feel a bit like a futuristic cyborg, which I'm totally okay with."

It's Official: Gwen Stefani Joins 'The Voice' 

Stefani made her NBC show entrance with a crew of female dancer in gold for a performance of her solo hit "Hollaback Girl," during which her fellow coach and the song's co-writer Pharrell Williams, with a new hat, came out to join her. "Two minutes ago, I was giving birth, and now I'm standing here in front of all you guys -- it's incredible!" she said after the performance.

Williams also performed his latest single "Come Get It Bae" (on which he collaborated withMiley Cyrus, thus the patterned outfits on the producer and dancers), and Blake Shelton sang his new single "My Eyes" with season-two Voice competitor Gwen Sebastian, who joined him in rehearsals to unofficially help the contestants, as did Maroon 5's James Valentine for Levine's singers.

'The Voice' Recap: New Coaches In, Nervous Singers Out

But onto the contestants (aka the reason we're supposed to be watching this show). Each with boosted productions onstage, the top 8 tried fought for finalist spots that are rarer than ever, as Tuesday night will bring the first-ever triple elimination (because double eliminations with Instant Saves aren't enough, right?).

For more on how they handled the pressure, head over to THR.com.