"He already has us wrapped around his precious little fingers!" Hartsock captioned the pic. "We are overjoyed to welcome the newest addition to our family, Asher Wrigley Siegfried… Born yesterday, (10/19) happy, healthy and strong!"
"Thanks to everyone for all of the love and support throughout Asher's pregnancy!" the new mom continued in the caption. "It really means a lot and we look forward to sharing this new chapter with you all."
The couple announced that they were expecting back in April, when they shared a the news to Instagram along with a beaming snapshot, which they captioned, "We have a bun in the oven and it's not the warm pastry kind!"
Check out the video below for a look at Hartsock's super sweet pregnancy announcement.