"All love...," he affectionately captioned the sweet image.
When Diesel visited TODAY in March, he opened up about the arrival of his family's latest addition. He and longtime girlfriend Paloma Jimenez also have a son, 4-year-old Vincent, and another daughter, 7-year-old Hania.
Diesel told Natalie Morales that he named Pauline after Paul Walker, his late co-star in the "Fast and the Furious" franchise, as he could feel Walker's presence when his daughter was born.
"He was in the room," Diesel recalled. "There's no other person that I was thinking about as I was cutting this umbilical cord. I just ... knew he was there."
Diesel thought that naming his daughter for his friend would be a way to keep Walker's memory alive.
"It felt like, you know, a way to keep his memory a part of my family and a part of my world."