(CNN) What's the first thing you noticed about this picture of political spouses and partners, other than Melania Trump's continued mastery of the color black?

It's probably the man in the back row, standing out against the nine women pictured. That's Gauthier Destenay, the First Gentleman of Luxembourg and the husband of the world's only acting openly gay prime minister.

Destenay and Luxembourg Prime Minister Xavier Bettel wed in 2015 , right after Luxembourg legalized gay marriage. When Bettel won the Prime Ministership in 2013, he was already in a civil partnership with Destenay and their sexualities were not a secret.

Can you name the rest of the people in this photograph? We'll help you out:

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