"Happy birthday to the love of my life," the Victoria's Secret model posted alongside a funny photo of her playing piggyback with the singer.
The expectant model added, "Everything is boring and meaningless without you!!! #BestHusband."
Earlier this month, E! News reported that the Namibian beauty is pregnant with the couple's first child.
"She knows what she's having and she's very excited," a source told us at the time.
"Yeah, we're gonna do it at some point in the not-so-distant-slash-undisclosed-slash-I-really-have-no-idea-big-question-mark future," he joked, and then quipped, "Is that ambiguous enough for you?"
All jokes aside, Levine added, "I love kids so much...I love seeing kids on the set, too."
Well well, it's only a matter of time before the proud papa-to-be can take his little one to The Voice set for all to see!