The worst kept secret in Hollywood is finally out -- Jessica Simpson and her fiance Eric Johnson are expecting!

For weeks, the singer has been walking around with a noticeable baby bump, and just moments ago Jess confirmed the news on her official website.

"It's true – I"m going to be a mummy," she tweeted, along with a photo of her holding her belly in a mummy costume.

This will be their first child together. Congrats!

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