The singer-and-actress is said to be expecting a baby with her former NFL player fiance, Eric Johnson, and has already been having some weird cravings.
An insider told In Touch Weekly magazine: "She`s already having kooky cravings, especially nacho chips dipped in chocolate, which satisfies her urge for salty and sweet. She`s also developed a taste for cheesy popcorn and non-alcoholic margaritas."
Speculation has been rife for weeks that Jessica was pregnant after she was pictured wearing loose-fitting clothing and the news was confirmed at Eric`s recent 32nd birthday party after she sent back a celebratory glass of champagne.
Despite the impending arrival, Jessica, 31, and Eric still plan to marry in November.
Jessica - who was previously married to singer Nick Lachey - has made no secret of her desire to become a mother and said she couldn`t wait to have kids with Eric.
She revealed: "I definitely see myself having a family with Eric, so that`s exciting to think about."
The news will also please Jessica`s mother Tina Simpson as she recently revealed she would like more grandchildren to go with two-year-old Bronx, son of daughter Ashlee Simpson and estranged husband Pete Wentz.
She said: "Obviously I`m looking forward to having more grandkids. Bronx is the love of my life."
"I don`t mind boys or girls, I`ll take anything I get. I`m not picky!"