"Highnesses" in British nobility

[Paul]

This question came up in a recent conversation.

Outside of the Windsor family, are there currently any spouses of UK nobility who were born with foreign royal titles? Thank you.

[Превед]

This question came up in a recent conversation.

Outside of the Windsor family, are there currently any spouses of UK nobility who were born with foreign royal titles? Thank you.

The current Duchess of Wellington was born HRH Princess Antonia of Prussia, if you count defunct monarchies.