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Simon Cowell

Brit's Officially On Board!!

(... Demi Too)

5/14/2012 1:52 PM PDT BY TMZ STAFF
breaking news

Simon Cowell twitter photo with Britney Spears, L.A. Reid & Demi Lovato
Simon Cowell finally announced what we all knew was coming ... Britney Spears is joining "X Factor" ... and so is some other girl.

Cowell just tweeted a photo of himself with Britney, L.A. Reid and the show's 4th judge Demi Lovato (pictured hovering awkwardly over Simon's shoulder).

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.

As we reported, negotiations between Britney and "X Factor" honchos went right down to the wire. Britney's conservators -- her fiance Jason Trawick and her dad Jamie Spears -- signed the $15 million deal on her behalf.

0514_XFACTOR_ANNOUNCMENT_WM
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.

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