Robert Griffin III and girlfriend Grete Sadeiko announced their engagement Saturday with a post on Sadeiko's Instagram.
Sadeiko also confirmed the two are expecting their first child in June.
"Today was the happiest day of my life and the last 8 months have been the most exciting time ever," Sadeiko wrote. "The man of my dreams and love of my life asked me to marry him today and we are one month away from welcoming our beautiful baby into this world."
Griffin, 27, started five games for the Cleveland Browns last season. In those appearances, he completed 59.2 percent of his passes for 886 yards, two touchdowns and three interceptions.
He's currently an unrestricted free agent.