Mamie Gummer

Credit: Bruce Glikas/FilmMagic

Engagements

Meryl Streep's Next Great Role: Mother-in-Law!

Originally posted 10/20/2009 08:05AM

Get ready for an acting dynasty: Actress Mamie Gummer, Meryl Streep's daughter, is engaged to stage actor Ben Walker, she told PEOPLE at the annual Whitney Gala Monday night, sponsored by Versace.

And he did on the old-fashioned way – on one knee.

"Yeah, he sure did," Gummer, 25, said, adding that her family is ecstatic. her dad is sculptor Don Gummer. "They're all very happy … we're very, very smiley."

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