(JB Lacroix/WireImage/Getty Images)

It's a boy for reality star Kristin Cavallari and her NFL fiancé Jay Cutler.

"We are thrilled to welcome Camden Jack Cutler into the world," Cavallari, 25, tweeted Wednesday. "He was born this morning weighing 7lbs 9oz. Everyone is doing great!"

The former "The Hills" star and her Chicago Bears quarterback fiancé announced in January they were expecting their first child, although she admitted to Glamoholic magazine that the pregnancy wasn't exactly planned.

"We weren't trying to have a kid but we weren't not trying; we left it up to fate," she told the mag.

The couple were engaged in April of last year but called it off just two months later. After a brief split, the couple reconciled in December.

"Sometimes, in order for things to get better, they have to end - even if it's momentarily," Cavallari told People magazine in December. "And that was the case with us."