"She welcomed her baby boy yesterday morning at 8:31am in San Diego, California," the rep told ET on Thursday. "He weighed in at 5 lbs, 3 oz. He was four and a half weeks early, but all is fine with mom and the baby."
The couple has yet to reveal the newborn's name.
Doctors expected Renee to go into labor early, as she experienced contractions six months into her pregnancy. The 33-year-old reality star was subsequently placed on bed rest and given medication to calm the contractions.
Renee has a daughter, Leiana, from a previous marriage, while Ericson -- who came under fire on the most recent season of the Lifetime reality series for cheating on his wife while she was pregnant -- has two sons.
Last month, Renee shared a sweet pic of her daughter cradling her pregnant belly. "My first little love, and 2nd coming soon," she wrote, adding two heart emojis and the hashtags "#proudmama," "#minime," and "#babyBriatt."