The magazine quotes a several sources who claim that it was Cutler who called off the engagement, but it is unclear whether the two have ended their relationship. Cavallari wrote to fans on her official Twitter page on Sunday, "Thanks for the support. Love u guys." However, she has not made any mention about the status of her relationship with Cutler.
Just last week the reality star, who is most famous for being on "Laguna Beach" and "The Hills," Tweeted about her engagement party. "Thx to all my amazing friends for making my engagement party a blast last night," she wrote on July 17.
Cavallari, 24, and Cutler, 28-year-old Chicago Bears quarterback, have been dating since the fall of 2010 and Cutler proposed to her during a trip to Cabo San Lucas in April. The couple was planning to wed in the spring of 2012 but had not yet set a date.
Cavallari, who hails from Denver, Colorado, starred on "Laguna Beach" between 2004 and 2005 and later appeared on its spinoff, "The Hills," between 2009 and its finale in 2010, replacing main star Conrad.
As recently as last week Cavallari tweeted about her recent engagement party.
"Thx to all my amazing friends for making my engagement party a blast last night!" she wrote.
The couple also had recently completed their wedding registry.
People reported that the break-up came as a shock to Cavallari, who had planned to move to Chicago for the upcoming football season.
Cavallari rose to fame in reality TV but has since dabbled in acting with appearances in ABC's The Middle and CBS' CSI: NY.
Cutler spent three seasons with the Denver Broncos after the 2006 NFL draft before being traded to the Bears in 2009.
