The crown princess of Denmark, who is married to Prince Frederik, gave birth to a boy and a girl eight weeks ago, providing 5-year-old Prince Christian and 3-year-old Princess Isabella with younger siblings.
Patricia Bailey told Woman's Day magazine: "The twins are fabulous, they've been so good for the whole family.
"But I think that's it now. I've got three children, big sister Jane's got three and Mary's got four. I think that's enough, we are at good numbers."
The twins' names are due to be announced soon.