Demi Lovato Sings Bang Bang with Jessie J at 99.7 Concert

7 Things you didn’t know about Demi Lovato►► For all your music needs ►► What do you do if you’re Jessie J and Ariana Grande isn’t around to sing her verse of “Bang Bang”? You get Demi Lovato to do it! What is up you guys, you’re back at Clevver Music where we’re giving you all the details on Jessie and Demi’s AMAZING on-stage collab. Jessie and Demi both took part in 99.7’s Triple Ho Show in San Jose, California on Wednesday night, and naturally, Jessie sa