A source tells ET that the couple is 'truly like a married couple who hasn't lost that spark.'
ET's Nancy O'Dell sat down with the country star as he dished on the latest changes in the NBC competition show.
Gwen Stefani will replace the Maroon 5 frontman for the next season of the series.
The singer shared how it was Levine who encouraged her to consider the NBC gig, on which she'll reunite with boyfriend Blake Shelton.
The singer opened up about coming back to the NBC competition series after Adam Levine's exit on 'The Talk.'
ET spoke with the singer backstage at her The Xperience residency at Zappos Theater at Planet Hollywood in Las Vegas over the weekend.
The pop star also opens up about NBC's decision to have Gwen Stefani step in to replace the Maroon 5 frontman as a coach.
ET spoke with John and his wife, Chrissy Teigen, on the red carpet at Sesame Street Workshop's 50th Anniversary Benefit Gala.
The reigning 'Voice' champ also weighs in on Gwen Stefani's return.
Levine gushed over his new project while speaking with ET just weeks before his shocking departure from 'The Voice.'
'Songland' premieres tonight on NBC.
ET has compiled the best Adam and Blake moments on 'The Voice,' following news Adam is exiting the hit NBC show.
Adam Levine is exiting NBC's hit singing competition show after 16 seasons.
Adam Levine shocked his fans on Friday when it was announced that he was leaving 'The Voice' after 16 seasons.
