American Singer Lil Nas X is expecting, in celebration of the impending delivery of his “baby” on Sept. 17, the musician, 22, did an over-the-top pregnancy shoot, complete with a bump and flower crown.

Lil Nas X (né Montero Lamar Hill) tells PEOPLE Magazine exclusively that he came up with the idea to do the shoot after listening to Megan Thee Stallion’s verse on his new song “Dolla Sign Slime” for the first time.

“I was like, ‘Oh my God, this is amazing,’ so I immediately called my stylist,” he says. “She was like, ‘Wow, this all comes together. Your album. Your baby.’ I was like, ‘Yeah, this is my baby, huh?’ As a joke, she was like, ‘Yeah, you should do a pregnancy shoot.’