It only happened for a few seconds, but viewers of the semi-finals of the competition noticed it.
Russia's entry for Eurovision this year is Polina Gagarina, with her song “A Million Voices”.
BBC / Eurovision / Via bbc.co.uk
In one instance the audience was shown and for a couple of seconds all you could see were pride flags.
BBC One / Eurovision / Via bbc.co.uk
Here's the moment in full.
BBC / Eurovision / Via bbc.co.uk