Newton's parents said the family is excited to welcome the new addition and that the couple hasn't settled on a name yet.
"It's going to be a giddy time of the year for us," Jackie Newton, Cam's mother, told WCNC. "I have no idea what this one is going to be called, but we will be happy."
Proctor gave birth to the couple's first son, Chosen, less than a year ago on Dec. 24, 2015.
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Cam Newton said they intentionally chose a unique name for their firstborn.
"I wanted something that would be masculine, but yet unique," he said in January. "I'm not a big fan of juniors, and every person that I've had this conversation when I say, 'I don't want to have the pressure of him being a junior,' they reply, 'What ... do you think Chosen's going to bring?'"
Newton said last year that he was initially quiet about his son's birth because he "didn't want to create a distraction" for his teammates.
The 27-year-old NFL player was first spotted with Proctor at the Kentucky Derby in 2013. Procter, 28, has a daughter from a previous relationship.
