Emma Roberts

Emma Roberts: Julia Roberts is 'A Great Mom'

06/25/2007 at 08:20 AM EDT

Raising three young children will be a breeze for Julia Roberts, her niece, Emma Roberts, says.

"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."