EXCLUSIVE: 9 Things You Didn't See on 'The Voice' Knockouts - Why Is Gwen Stefani Crying?!

Go behind the scenes of The Voice!
ET has your exclusive look at what you didn't see on TV during Tuesday night's knockouts, including a tearful moment from Gwen Stefani and hilarious verbal sparring between Blake Shelton and Adam Levine. Watch above!
The Voice airs Mondays and Tuesdays at 8 p.m. ET/PT, with the live rounds set to kick off on April 17.
Earlier this week, Stefani made a hilarious revelation about her own "makeout playlist," which apparently features Foreigner's "I Want to Know What Love Is." 
“I told you I knew that song,” Shelton piped in, prompting a swift "Ew!" from Levine. Relive the moment, below.