However, their supporting act Becky G (nearly) came to the rescue, when she ran on stage with the Argentinian flag to help her cover up.
But it didn't go exactly to plan...
While the girls were singing "All In My Head" Becky ran on stage looking like a crazed fan, and security was quick to grab her and tackle her off the stage.
You can hear in the video concerned fans yelling, "That's Becky G!!"
The best part about it is that Normani continues her perfect routine choreography while she looks concerned off to the side over what just happened.
Shortly after, Ally gets Becky back on stage and they laugh it all off.
Thankfully, Becky didn't take it all too seriously, later tweeting, "Now you know I'm your number one fan @dinahjane97 ."