Ashlee Simpson-Wentz is looking for inspiration to adopt healthier dieting practices after the pregnant singer was told that she has gained too much weight during a recent prenatal visit.

“Ashlee broke down in tears at a doctor’s appointment in early August when she found out she’s gained more weight than is considered in the healthy range,” a Star source says.

A long-faced Ashlee immediately took a trip to Malibu’s Planet Blue and stocked up on six pairs of size zero jeans to motivate her to curtail her eating:

“She can’t wear them now, but she hopes it will give her the incentive to watch what she eats.”

Ashlee will welcome her first child with husband Pete Wentz in October.