Only three weeks after they got married, Renay Smith confirmed she'd given birth to a boy by posting a photo of his tiny hand on Instagram.
"Prince Shaffer Chimere Smith Jr has arrived," she wrote.
"6 pounds 8oz, 19 inches. It was the scariest delivery ever and I ended up getting a emergency C-section because of complications.
"With the help of my amazing doctor and my super calming husband I was able to get through it all and come out with best reward in the world."
Ne-Yo has two children with his former partner Monyetta Shaw - Madilyn Grace, five, and Mason Evan, four.
He revealed in September 2015 he was expecting his third child with his new partner Renay Smith.
Just a day before announcing the birth of her son, Renay Smith shared a photo of Ne-Yo cradling her baby bump.
"I began this journey with you and here we are at the finish line stronger than ever together," she wrote.
The couple married on 20 February 2016.
Before the wedding Crystal joked her baby bump made her nervous about walk down the aisle.
"I'm gonna be honest: I'm nine months pregnant - I’m nervous about falling on my face," she told PEOPLE.