The BBC Radio 1's Teen Awards are taking place in London on Sunday.
And after doing so, she straight up fell down a hole in the stage on to a platform from which the winners were emerging.
There was a loud bang, and you can see her microphone fly across the stage.
Soon afterwards Collins was up and said: "Oh my god, I'm so sorry about that. This is live, this is what happens."
Collins tweeted afterwards to say she was OK, describing the fall as "the best and worst moment of her life."