Jessica Simpson found out she was pregnant thanks to pre-cocktail "guilt."

The 31-year-old Fashion Star mentor - who is expecting her first-born with fiancé Eric Johnson - admits she was overcome by bad feelings as she prepared for a drinking session: "We were going to have an all-day drinking binge. Going to ride our bikes, hang out ... do naughty things. But I started feeling this overwhelming guilt. Why would I feel guilt at the idea of going out and having cocktails with my friends?"

A pregnancy test confirmed her suspicions, and Jessica is expected to give birth to a baby girl this spring.

But the Dukes of Hazzard actress is praying her daughter inherits her sense of style: "I swear I will croak if she asks me for a pair of Nikes instead of Christian Louboutins! Eric is so athletic. We're going to have this athletic girl and I won't even be able to take her shopping."