During her Piece of Me show in Vegas Wednesday (Aug 9) night, a fan rushed up on stage during a pause in "Crazy" (ironically enough) and Britney legit looked terrified. And understandably so! Especially with what happened at Ariana Grande's show in Manchester. Luckily, the Queen's security team was quickly there to block any and all crazies and take her off stage while other guards and dancers took care of the situation. Once everything was settled, Britney came back out and finished her set like the PRO she is!