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"She is really easygoing and loving," the 16-year-old Nancy Drew star tells PEOPLE. "She's a great mom."
Roberts, 39, and husband Danny Moder, 38, welcomed their third child, a boy named Henry Daniel Moder, on Monday in Los Angeles.
The couple – who will celebrate their fifth wedding anniversary on the 4th of July – are also parents to twins Hazel and Phinnaeus, who turned 2 in November.
"[They] are really happy," says Emma. "It's a good age difference with the twins."
