And, here was the response...
Kris Jenner @KrisJenner:
Oh yeah!! Oh yeah!! "@PerezHilton: @KrisJenner It's OFFICIAL! Khloe Kardashian And Mario Lopez To Co-Host X Factor! http://shar.es/5LTp9
Kim Kardashian @KimKardashian:
U will make such an amazing host! RT @KhloeKardashian The rumors are true. I'll be hosting @TheXFactorUSA this season http://bit.ly/RzxKxD
Pia Toscano @PiaToscano:
I LOVE Paige Thomas!!! She is stunning, humble & talented- so refreshing! #xfactor #beepic
Kourtney Kardashian @KourtneyKardash:
Wooooohoooooo! Pour the champagne! http://bit.ly/R3nBME Big congrats to @KhloeKardashian!
Britney Spears @britneyspears:
Welcome to @TheXFactorUSA team, @KhloeKardashian and @MarioLopezExtra - so excited to have you as co-hosts! #WelcomeKhloeAndMario
Ryan Seacrest @RyanSeacrest:
Welcome @khloekardashian + @mariolopezextra to our host treehouse. For the record, "dim the lights" is mine, don't even try.
Piers Morgan @piersmorgan:
@MarioLopezExtra @TheXFactorUSA @SimonCowell Congrats, Mario - very smart move by Simon (unusually....).
L.A. Reid @LA_Reid:
Congratulations! @KhloeKardashian @TheXFactorUSA #BeEpic
Dancing With the Stars' Cheryl Burke @cherylburke:
@KhloeKardashian woohoo!!! Congrats babe!
Extra correspondent Terri Seymour @terriseymour:
Finally it's official! Congratulations @MarioLopezExtra on hosting @TheXFactorUSA
Tune into an all-new special one-hour episode of THE X FACTOR featuring the conclusion of the Judges' Homes round at 9:30/8:30c on FOX.