Kelly Osbourne and Luke Worrall: It's Over!

Kelly Osbourne and fiance Luke Worrall are over and done with.

Rumors of a split between the couple were fueled Wednesday morning by exchanging angry messages on Facebook (NOTE: click here to follow THG on Facebook).

"Luke Worrall makes me sick!!!" the reality star, 25, seethed. Why so upset? A short time later, Perez Hilton posted on his blog that Worrall, 20, had cheated.

Neither Worrall nor Osbourne has commented on that allegation.

Kelly Osbourne and Luke Worrall have split up.

"Thank you all so much for your support but the matter is private and will not be commenting enough damage has already been done!" Kelly wrote Wednesday.

A few hours later, Kelly Twittered (follow THG on Twitter) that she would "comment through song," linking to En Vogue's "My Lovin' (Never Gonna Get It)."

She added, "You can take my heart but NEVER my sense of humor!"

Amen to that. The two - who began dating in 2008 - confirmed their engagement last year. We wish them both the best in this difficult time, and hope another feud with Tila Tequila doesn't erupt over this private matter, Kelly.