Charli XCX, Caroline Polachek and Christine & The Queens believe the three singers are working on an upcoming track together.Charli has worked with both Polachek and Christine separately in the past, and a new Instagram post from Charli has fans speculating about a three-way collaboration in the near future.Sharing a host of images on social media yesterday (September 22), Charli shared the photo in question, which sees the trio posing in what looks to be footage from a music video, with the