Jessica Simpson DUH, I'M PREGNANT

Jessica Simpson pregnant
Jessica Simpson has finally confirmed what everyone already knew ... she's pregnant.

The singer just tweeted, "It's true ... I"m going to be a mummy!" -- posting a pic of herself in a mummy costume ... holding her baby bump.

Scary.

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1:45 PM -- Sources close to Jessica tell us ... her big announcement crashed her website after more than 1 million people tried to access it less than a minute after she posted the news.