Olivia Wilde & Jason Sudeikis Let Their Love 'Soar High' At Disneyland! See Pics HERE!

Uh-oh! Looks like someone is in trouble -- and possibly really bitter!

On last night's X Factor finale, our favorite Miz Demi Lovato dropped the F bomb LIVE on the show!

That's one way to make your last episode memorable!

The slip wasn't all that surprising though, seeing as it was after the producers aired Simon Cowell's "annoying juice" bit, which showed Demi sucking down on a brightly colored liquid and throwing jabs at Simon after the fact. For some, it may seem harmless, but in this case, it was super insensitive to Demicorn's recent discussions about her drug and alcohol problems!

The singer is visibly offended by the supposedly "funny" bit, and at the end, she was so fed up that she dropped the bomb!

Ch-ch-check out Dem-Dem's slip of the lips (above)!!

Hmm... Wonder if she went to the after party after THAT!

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