"He already has us wrapped around his precious little fingers! We are overjoyed to welcome the newest addition to our family, Asher Wrigley Siegfried. Born yesterday, (10/19) happy, healthy and strong!...#babyboy #Asher #heartmelted," Hartsock captioned an Instagram photo of the baby holding her finger on Thursday night.
"Thanks to everyone for all of the love and support throughout Asher's pregnancy! It really means a lot and we look forward to sharing this new chapter with you all."
Asher Wrigley weighed eight pounds when he was born and measured 20.5 inches, according toUs Weekly.
"Words can't even express the amount of love we feel for our baby boy Asher," the new mom gushed to Us.
"He has already brought so much joy into our lives in one day. He's strong, healthy, happy, playful and warm. Chris and I are beyond blessed with this beautiful gift of life that we are excited to have as a part our family."
In August, Hartsock and Siegfried revealed the baby's sex. Four months earlier, Hartsock announced she was pregnant with their first child.
Hartsock officially found out she was pregnant during a February vacation with her husband in Maui.
Siegfried proposed to Hartsock during The Bachelorette's Season 9 finale, which was filmed in May 2013 and aired three months later on ABC. The show's star selected the former pro baseball player over runner-up Drew Kenney after getting over the heartbreak of frontrunner Brooks Forester unexpectedly dumping her.
Hartsock and Siegfried, both 30, got married in January 2015.