The season 19 Blind Audition, Battle Rounds and Knockouts were all taped before Stefani and Shelton went public with their happy news in October, which means the live shows are the first time the No Doubt singer has been rocking her epic sparkler on the show.
Even host Carson Daly had to say something. He found his opportunity when he introduced country crooner Ben Allen, who "Gwen stole from her fiancé -- it's official now, we're live!"
"Blake has been the one who wanted to take it slow in the beginning but recently he decided it was time," the source shared. "During the pandemic, they’ve had lots of downtime together and he truly saw the importance of spending life with the person you love. Gwen takes marriage very seriously and was disappointed that her first marriage [to Gavin Rossdale] didn’t work out. She wasn't in a hurry because she wanted to ensure Blake was ready."
Meanwhile, according to the source, Stefani quickly "fell head over heels for Shelton," and knew he was "the one" during their first year together.
"She is very old fashioned and told friends she wanted to wait until she received a proper proposal from Blake," the source said. "They have lived like a married couple for so long that those closest to them already saw them as 'married' but now they are finally making it official and their family is excited by the announcement."
Watch the video below for more. The Voice airs Mondays and Tuesdays at 8pm PT/ET.