Kristin Cavallari and fiancé Jay Cutler
07/24/2011 at 02:00 PM EDT
This is not the fairy-tale ending Kristin Cavallari
was hoping for.
After just 10 months together
, Cavallari and Chicago Bears quarterback Jay Cutler have called off their engagement, a source confirms to PEOPLE.
"She got dumped," says another source. "She's absolutely devastated. She can't believe this is happening."
The couple, who were planning a spring wedding, became engaged in April, when Cutler popped the question
in Mexico. They had been spending much of their time recently in Chicago, and Cavallari had planned to move there during the upcoming football season.
"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."
Just a week ago, Cavallari Tweeted about her engagement party. "Thx to all my amazing friends for making my engagement party a blast last night!" she wrote
The couple had completed their wedding registry
, and Cavallari was determined to be in great shape
for the wedding.
Saturday night Cavallari hit The Beverly, an L.A. lounge, and was spotted without her engagement ring.
"She was hanging out at a table with Nicky Hilton and Alessandra Ambrosio," a source tells PEOPLE. "She was telling friends how they called off the engagement."
A rep for Cavallari had no comment.