Kelly Osbourne will not be getting her happily ever after.  Osbourne and her fiance, Luke Worrall, have called it quits after spending two years together.  Sources tell that Kelly, 25, discovered Luke, 20, has been CHEATING on her.


Kelly and Luke went back and forth with comments on Facebook, but Kelly deleted all but one comment, which said:


"Luke Worrall makes me sick!!!" 


Worrall has yet to comment on the alligations.  Osbourne took to her TWITTER account to thank fans for their support during this hard time, saying:


"Thank you all so much for your support but the matter is private and [I] will not be commenting enough damage has already been done!"