Kelly Osbourne: I Am Not "Dealing With" Split "Very Well"

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Breaking up is hard to do.

Just ask Kelly Osbourne.

The same day reported that she and fiance Luke Worrall called it quits, she wrote on her Twitter page: "i am not dealing with this very well :( keeping your head up is not fun! going to bed thank god for tomorrow!"

Osbourne, 25, and Worrall, 20, began exchanging angry messages on their Facebook pages earlier this week. In one message (which has since been deleted), the MTV reality star wrote: "Luke Worrall makes me sick!!!"

PerezHilton posted on his blog that Worrall had been caught cheating (neither Worrall nor Osbourne has commented on the celeb blogger's allegation.)

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But Osbourne has made it clear she and Worrall are over. She Twittered a link to the En Vogue break-up anthem "My Lovin' (Never Gonna Get It)."

The two -- who began dating in 2008 -- confirmed their engagement last year.