Model Ashley Graham announced the birth of her first child, a boy, in an Instagram stories post.

The supermodel and her husband of nine years, filmmaker Justin Ervin, welcomed the boy Saturday, Graham wrote on Instagram.

"At 6 p.m. on Saturday our lives changed for the better," she wrote on her Instagram story. "Thank you for all your love and support during this incredible time."

Graham, who hosts the podcast "Pretty Big Deal," tagged her husband in the post but did not provide other details, including the boy's name, People reported.

Graham announced her pregnancy in August on the couple's ninth wedding anniversary.

Ervin and Graham dated for a year before getting engaged in 2009. They married two months later.