Demi Lovato just reminded us that "Cool for the Summer" is still an absolute banger by bringing Brazilian drag royalty Pabllo Vittar onto the Rock in Rio stage for the finale. There's something proper brilliant about a surprise guest that actually *elevates* a track rather than just ticking a box, and this pairing sounds like it had genuine chemistry. If you've been sleeping on either artist, this kind of crossover moment is exactly what live festivals are for, unexpected collaborations that make you actually pay attention.