Carter James, the couple's third child together, arrived at 9:44AM on Tuesday, December 27 via cesarean section, People reported.
Carter reportedly weighed eight pounds and four ounces. He was named after Lueders' father, Brian Carter Lueders, who died in December 2015.
Csincsak, the 34-year-old former fourth-season The Bachelorette winner, announced the big news on Facebook shortly after the Christmas holiday.
"Well Carter James Csincsak Finally Made it Here !!" the professional snowboarder wrote of the newborn, who joins big sister Charlotte Jean, 2, and brother Noah Theodore, 5.
The parents confirmed Lueders' third pregnancy in June 2016.
"I am so excited to be a dad of three... I feel so bad for my wife Ann as she gets the worst sickness ever for like eight months of each pregnancy," Csincsak reportedly said at the time. "However, it's a fun challenge, as we love the outdoors, to figure out how to make it work with all the kiddos with us."
Csincsak met Lueders, who's a former thirteenth-season The Bachelor bachelorette, in 2010 at a Bachelor event he was hosting.
In addition to gushing about how Charlotte and Theodore were super excited to become siblings, Csincsak toldUs Weekly in June, "It's crazy to think that nobody has ever had three kids from this show. We're the only people to ever do that."
"So I feel proud of everything that we've been through and the journey," he continued. "I feel blessed to have a beautiful wife and three beautiful children all from the show. It's pretty awesome."
DeAnna Pappas selected Csincsak over Jason Mesnick and got engaged to him at the conclusion of her The Bachelorette edition in 2008, while Lueders appeared on Mesnick's The Bachelor edition that same year but was eliminated in Week 1.
Csincsak broke up with Pappas in November 2008 and then dated twelfth-season The Bachelor bachelorette Holly Durst before he and Lueders began their relationship.
Csincsak and Lueders then got engaged, announced they were pregnant with their first child, and got married all within August 2010. Lueders took the name Csincsak when they exchanged vows. The couple's son Noah later arrived in February 2011 and then daughter Charlotte Jeanne was born in March 2014.