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Cowell just tweeted a photo of himself with Britney, L.A. Reid and the show's 4th judge Demi Lovato.
Simon included a message with the pic -"Can't believe it's finally happened. Very exciting!"
FOX just made the announcement at the Upfronts in NYC -- where advertisers vie for commercial airtime on TV shows "up front" several months before the shows actually premiere.
Britney's conservators - her fiance Jason Trawick and her dad Jamie Spears - signed the $15 million deal on her behalf.
Demi signed her deal immediately before Upfronts as well. It's unclear how much she's getting paid , but it's fair to assume her paycheck's gonna weigh a lot less than Britney's.
What do you think?
Are you excited?
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