Jessie J performed in San Jose last night and she brought out a very special guest for "Bang Bang".
It wasn't Nicki Minaj, or Ariana Grande.
It was Demi Lovato! Looking stunning in a matching black crop top and skirt, she sang Ariana's part in "Bang Bang". We've got to say, she did a pretty damn good job hitting all of Ariana's high notes.
You can hardly hear them over that loud roar of screaming fans!
It's 2014 so of course, bring on the backstage selfless!
Looks like Demi had a really good time. She tweeted Jessie that performing with her was "an honor".
... That just happened..... Thank you SO much @JessieJ for having me on stage for Bang Bang... It was an honor!
— Demi Lovato (@ddlovato) December 4, 2014