and the superstar didn't disappoint the crowd of thousands! Gaga did several costume changes in a flash -- from her in the dirt with skeletons, to being lifted by her dancers while being dressed in ...

We got a first glimpse of Milly Alcock suited-up as the Girl of Steel on the London set of DC Studios' Supergirl ... clearer look at Alcock's costume, and the House of the Dragon star appears ...