Jessica Simpson says she's still pregnant

Recork those bottles of champagne: Jessica Simpson is still pregnant.

The "Fashion Star" mentor, 31, tweets Saturday (April 21), "To everyone who keeps congratulating me on the birth of my baby girl...I'm still pregnant!! Don't believe what you read ladies and gents."

Simpson, who apparently has the gestation period of an elephant, is expecting a baby girl with fiance Eric Johnson, 32, and a source tells In Touch that the pop star and fashion designer will be delivering via a scheduled cesarean section.

"She was so anxious, she was even breaking into cold sweats at night," the source says. "She desperately wanted to experience the joy of a natural birth, but decided to go with what made the most sense for her."

Anyone want to go in on the "When will Jessica Simpson pop?" pool?