jilt (jlt) tr.v. jilt·ed, jilt·ing, jilts To deceive or drop (a lover) suddenly or callously. n. One who discards a lover. [Possibly from obsolete jilt, harlot, alteration of gillot, diminutive of gille, woman, girl, from Middle English; see gill4.]
doesn't mean specifically at the altar, just means suddenly, without warning.
If it was a genuine reason for calling off her wedding then I feel very sorry for her but if it was just a means to grab the headlines of the scandal and gossip rags (pushing Jordan or whatever she calls herself now off the front page) then shame on the pair of them.
AnotherJaffaCake - The Daily Fail reported on the day of her wedding that her fiance had been sending explicit text messages and pictures of her to his ex-girlfriend. The timing of the article wasn't very nice, nor was the quite gleeful way they reported it, and I'm quite stumped as to why the heck he was sending pictures of his fiance to his ex.