Behati Prinsloo and Blake Shelton delighted fans by posing for a "baby bump" photo.
"Met these two sweet pregnant ladies today. Good luck @blakeshelton and @behatiprinsloo," he captioned the playful photo.
Shelton and Levine are known for their friendly rivalry on "The Voice."
The pair snapped a selfie with Prinsloo and Shelton's girlfriend, Gwen Stefani, this month after Shelton and Stefani debuted their duet on the NBC reality competition.
Levine previously posted a "baby bump" photo of his own, writing, "Week 20 and I'm finally popping! #impregnanttoo."The 37-year-old singer and Prinsloo married in 2014 and announced they're expecting their first child in March.
"[I'm] super excited," he said of fatherhood on "The Tonight Show Starring Jimmy Fallon" in April. "[Behati] is good. She's eating a lot of watermelon. Like, you know, because you get random cravings for stuff, and it's just like, so much watermelon."
"Since [I] was a little girl, I always wanted a family, a big family," she told The Lowdown prior to news of her pregnancy. "I'm an only child so I wanted like 10 kids... for sure."
Shelton and Levine appear on "The Voice" on Mondays at Tuesdays at 8 p.m. ET.
