Gary kept fans updated on his Twitter account, sharing that they were on their way to the hospital last night. "She might be coming! This could be it so excited!" he wrote.
Turns out, she was coming, and everything happened very quickly. Two hours later, Gary shared the good news, by simply writing "she's here" and then later tweeted that he was "totally doing skin to skin" in case anyone wondered how he was bonding with his baby.
The baby, whose name has not yet been released, is the second child for Gary, who shares a daughter Leah, with Amber Portwood. As we saw on Teen Mom OG, Amber understandably had a tough time when she heard that Gary and Kristina were expecting, but it sounds like little Leah is thrilled to be a big sister.
Gary shared this adorable note that Leah had written to her sister just hours before she arrived.