The photo was taken at a 33rd birthday lunch for her fiance (and baby's daddy) Eric Johnson at Shutters, a café often frequented by celebrities. The blonde singer wore a black top along with the jean shorts she famously sported in 2005's The Dukes of Hazzard feature film.
"All the weight did not come out with the baby," she said. "I had to stay focused on my diet. I want to be as healthy as I can because I'm a mom now."
Fun fact: The term "Daisy Dukes," referring to Catherine Bach's character (and wardrobe) on the original Dukes of Hazzard TV series, was popularized in 1993 by hip-hop duo Duice in their song Dazzey Duks.