MBELDOG BLOG

Kristin Cavallari and Jay Cutler are "very in love" and "so happy," a source tells PEOPLE, which stands to reason: Cutler popped the question over the weekend.

So what do we not know about the romance of the reality starlet and her NFL star fiancé?

They only began dating last fall, and their relationship has been primarily long-distance, but by January, Cavallari, 24, admitted Cutler already had her heart. "I'm in love and it's been great," she told PEOPLE. "Things are really good."

"Chicago is great for me," Cavallari has told PEOPLE. "My mom and that whole side of the family is there … It's been nice to hang out with my mom." In fact, since the engagement, a source tells PEOPLE, Cavallari has been spending a lot of time out there.

Noting he "had no energy," Cutler, who lost 35 lbs. in 2008, told the Associated Press that he'd been diagnosed with insulin-dependent diabetes. "It's a little overwhelming to get that news and realize you're going to have to completely change your life," he said, adding that the diagnosis is not expected to affect his play.

Among other philanthropic ventures she taken on, Cavallari has been involved in Until There's a Cure, a campaign to raise awareness and funds for AIDS and HIV.

Cutler does volunteer work for young people with developmental disabilities through Vanderbilt's Best Buddies program – and in 2007, he started the Jay Cutler Foundation, which partnered with Mile High United Way’s Youth Success Initiative to help at-risk youth overcome obstacles and graduate from high school.

Cutler, 27, was verbally attacked by some of his Chicago Bears teammates after the 2010 NFC Championship game against the Green Bay Packers for sitting part of it out due to a knee injury and appearing disinterested on the sidelines. Cutler later said the criticism "bothered" him. 

Credit: PEOPLE (Dhavi Shira)