Only ten months after they started dating, The Hills star Kristen Cavallari and her football playing ex-beau have called it quits!

The pair got engaged in April when Chicago Bears quarterback Jay Cutler proposed to Kristen in Mexico. So much for a fairytale ending…

Reports say that Kristen didn’t see the break up coming, and that she was devastated.

“She was planning her dream wedding, the date was set, the location – everything was set,” the source says. “She’s in shock that the dream wedding she was planning is going to end this way.”

The plan was to have a spring wedding, and the couple had already completed their gift registry.

After her engagement party last week, Kristen tweeted; “Thx to all my amazing friends for making my engagement party a blast last night!”

No word yet as to why the couple split. Poor girl!