Ashlee Simpson and Pete Wentz are expecting a baby boy, a rep from the baby boutique Petit Tresor tells CelebTV.com exclusively.

The couple, who married in May, filled out a registry for their baby in June and our source says, “almost everything is blue.”

A salesperson who helped the couple said, “They [Simpson and Wentz] made it very clear that it was a boy.”

On June 30, the rocker couple bought a few T-shirts and bibs from Plain Mary with the words, “Hunk,” “Loved” and “Yummy” emblazoned on the front. The shirts retail for $28 and the bibs for $18.

Simpson and Wentz will visit the baby boutique next week to discuss the nursery, our source confirms.

Simpson’s rep did not immediately return our call for comment.