Be warned that this is a silly thread.
German adopts several English expressions. One of them is 'First Lady'. So journalists write about 'First Lady' in the middle of a German sentence whenever the spouse of a head of state comes into the picture.

We had never a problem in this respect with the USA. But German journalists have some difficulties with this expression when they refer to Germany or Britain. The wife of our chancellor, Doris, is sometimes called 'First Lady' (though she is his fourth wife and he isn't head of state).

And recently, Cherie Blair has been named 'First Lady' of Britain in some German newspapers. Would that make Elisabeth the Second Lady (isn't she called Elisabeth the second anyway)? This question had to be solved and DER SPIEGEL has asked readers to vote who should be named 'First Lady' in/of Britain. Several choices we had, M. Thatcher for instance for being the first Lady prime minister, but the winner was

Prince Philip (and Elisabeth, once more, was only second).

Somehow, I didn't have the impression that all readers of DER SPIEGEL did take the survey with the necessary seriousness.

Wolfgang