Adam Levine shares new photo of sizzling mom-to-be Behati Prinsloo

Adam Levine couldn't be prouder of his pregnant wife Behati Prinsloo. The father-to-be shared a striking photograph of Behati on Instagram on Monday, showing the Victoria's Secret model showing off her blossoming baby bump, wearing nothing but a pair of jeans. "YOWZA," Adam, 37, captioned the black and white snapshot, along with a couple of flame emojis.

Adam and Namibia-born Behati, 27, are expecting their first child, a baby girl, on 20 September. They have both been documenting Behati's body transformation on social media, putting the spotlight on her baby bump with a series of sweet images.

TAP TO VIEW GALLERYbehati Adam Levine shared a sizzling new photo of wife Behati on Instagram on Monday

To mark Behati's 20th week of pregnancy, Adam decided to showcase his own 'bump', uploading a photo of the couple posing together for a mirror selfie. A few weeks later, he also shared a photo of Behati posing with his Voice co-star Blake Shelton, both with their hands on their stomachs. "Met these two sweet pregnant ladies today," Adam joked in his caption. "Good luck @blakeshelton and @behatiprinsloo."

News of Behati's pregnancy was revealed in March – and soon afterwards Adam spoke about his excitement at becoming a first-time father, and revealed his wife's pregnancy craving.

Adam Levine and Behati Prinsloo compare their stomachs The couple compared 'bumps' in a recent funny snapshot

"She's eating a lot of watermelon. A LOT of watermelon," the singer told Jimmy Fallon on The Tonight Show. "Because, you know, they get random cravings for stuff and it's just like, so much watermelon!"

Both Adam and Behati have been open about their desire to start a family together. Just one month after their July 2014 wedding, Adam revealed that the couple were keen to have children. "We're definitely going to do it," the She Will Be Loved singer told Ryan Seacrest during an interview on KIIS FM radio. "I want to have 100 kids. I want to have more kids than would be socially responsible."

Behati Prinsloo and Adam Levine look into each other's eyes with smiles Adam and Behati have been married since July 2014

Behati, meanwhile, recently told online magazine Obsev's The Lowdown: "You know, I've always, since a little girl always wanted a family, a big family. I'm an only child so I wanted like, ten kids for sure."

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