MTV's favorite bad girl, Kristin Cavallari of "Laguna Beach" and "The Hills," has given birth to her first child, she announced via her Twitter account.

Cavallari wrote Wednesday that she and her longtime boyfriend, the NFL's Jay Cutler, welcomed their first son into the world.

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

This is the first child for Cavallari, 25, and Chicago Bears quarterback Jay Cutler, 29.

Last month "The Hills" star shared a picture of her "massive bump" and tweeted, "Jay is making me lasagna . . . he takes such good care of me good thing because I can barely move."

Cavallari announced her pregancy in January.

"We are thrilled to announce we are expecting our first child together," the couple said at the time. "It's an amazing time in our life and we can't wait to meet the new addition to our growing family."

The former reality star received warm congratulations from her Twitter followers and she thanked them for all the wishes that were sent to her and her "little bun in the oven," MTV reported.

Rumors began to fly about the couple, who had been previously engaged before Cavallari announced that she was pregnant. Cutler, who proposed to Cavallari again in Novemeber 2011, according to reports, wrote that he was happy to be starting a family with his fiancé.

"We couldn't be more excited," MTV quoted him saying. "We don't usually comment on our relationship, but for the record I never broke up with Kristin. It's unfortunate some people are saying hurtful things during such a joyous moment in our life."

The couple doesn't seem to be finished having children either.

"We want four kids, so we're thinking maybe have one more, then get married, then have two more," Kristin Cavallari told Glamaholic's March issue. "But we'll see - it all depends on how the first one goes."