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.
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.
DUH, I'M PREGNANT
10/31/2011 1:25 PM PDT BY TMZ STAFF
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