In the video, Memphis is holding on to his dad's shoulders as he swoops in and gives sister, Navy Rome a kiss on her forehead. The 41-year-old country star tells his son to "Give sissy some sugar!"
The one-year-old also wore a T-shirt that said "Big Brother."
"Meeting baby sis for the first time?," the 30-year-old wrote alongside the clip.
Jason and Brittany welcomed their new bundle of joy on Monday, February 4. The couple are already parents to Memphis, while Jason has two daughters, Kendyl, 11, and Keeley, 15, from his previous marriage.
Before Brittany gave birth to Navy, she opened up about past fertility issues. She wrote on social media, “Jase and I passed the fertility center that was basically our second home for over a year and a half. The memories came rushing back… so many smiles and so many tears during that time. Yes, there was loss but there was also success. As I look through these photos I can’t believe that we are about to have our second baby. WHAT A BLESSING♥️.”
What are your thoughts on Memphis meeting his new sister? Sound off below!