Gertrude d'Orleans, "The Holy" Bastard

Gertrude:

"Alas, ... “That drop of blood that's calm proclaims me bastard”; “I a noble father lost” ... me with love in honourable fashion”; “with almost all the holy vows of heaven!”

From Hamlet Act 4, Scene 6 Laertes says: "That drop of blood that’s calm proclaims me bastard, Cries “Cuckold!” to my father, brands the “harlot” Even here between the chaste unsmirchèd brow Of my true mother." (Gertrude)

So why is Gertrude called the "Holy Bastard"? Besides, she was Danish, not Belgian.