The Netflix and Sky Bulletproof Top Boy star posted an article about the birth on Instagram.
“Wow, God is good,” he posted
“Meet my granddaughter guys. Neveah Jade Walter 6/12/2020 / Bravo son. I am so proud of you and of T. More life. ”
Noel Clarke was one of the first to congratulate him, with the Walters Bulletproof co-star having a cheeky dig, posting, “You’re a grandfather now. You will never hear the end of this from me !! I love you man. ”
Chelsea star Tammy Abraham and musicians Giggs and Michael Dapaah (Big Shaq) were also among those who sent their love.
Walters did not say which of his sons became a dad.
The Peckham-born star has two children and a stepson with actress wife Danielle Isaie, as well as two older sons and a daughter with ex-partner Natalie Williams.
He also shares two daughters with another former partner.
Walters first rose to prominence in the So Solid Crew group, best known for their 2001 hit 21 Seconds.
In recent years, he has been widely regarded for his role as Dushane in Top Boy – which first aired on Channel 4 nine years ago.
The series – about London’s drug gangs – moved to Netflix last year after rapper Drake said he was a fan and helped resurrect the series.
Walters also stars alongside Noel Clarke in Sky One’s Armored, with the pair playing maverick detectives Bishop and Pike.