Eberstein’s mother Susanne confirmed the news to Swedish magazine Aftonbladet, The New York Post reports. The couple already have two children, son John Mungo, five, and a daughter, two.
“I’m very happy to be getting another grandchild,” Susanne told Aftonbladet, adding, “She’s due rather soon.”
Eberstein, 35, attended the Golden Globes with 57-year-old Grant this week. The actor also has two children from a previous relationship with Tinglan Hong: six-year-old daughter Tabitha and four-year-old son Felix.
This article originally appeared on marie claire.