Mamie Gummer Is Engaged!

 Duffy-Marie Arnoult/

Meryl Streep's little girl is getting married!

Actress Mamie Gummer confirmed to that she and actor boyfriend Ben Walker are engaged.

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"He proposed two days ago," the actress, 26, announced Monday in New York at the Whitney Museum of American Arts Gala, noting that he "surprised" her with a custom-made ring.  "He did it on one knee!" she said.

Dating for about a year and a half, Gummer and Walker met working on a short film, and later performed together in a spring 2008 Broadway production of Les Liasions Dangereuses.

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"My mom loves him!" the Taking Woodstock actress gushed.  Gummer is the second eldest child to Oscar-winner Streep, 60, and sculptor husband Don Gummer, who have four children.

"We are very happy!" Gummer said of Walker, her date at Monday's gala.

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