After Levine, 35, and fiancee Behati Prinsloo, 25, tie the knot on July 19 in Mexico, the couple plan to start a family immediately, OK! Weekly reported in its July 7 issue.
"Adam and Behati want to have a baby right away, and can't wait to start trying," an insider told OK!.
While Levine previously discussed how he definitely wants children but it wouldn't matter if he was married to the mother or not, he reportedly took the traditional approach with Prinsloo considering she comes from a very religious background.
"Marrying first was important to her," the insider said.
The couple will wed in an intimate ceremony at the Hotel El Ganzo in San Jose del Cabo, and according to the magazine, they'll head to South Africa afterwards for their honeymoon and try to conceive a baby.
"The main focus will be trying for a baby, which Adam is thrilled about!" noted the insider. "And Behati is dying to be a mom!"
Prinsloo, a Victoria's Secret model, has reportedly been reading baby books and studying different potential birth plans for the delivery.
Levine and Prinsloo met in May 2012 and reunited after a brief split in early 2013. They got engaged in July of that year.