Charli XCX recently posted a picture with the band BTS - which she captioned "first day as the newest member". BTS Also tweeted a picture of the bunch together. Fans have been reacting on Twitter ever since, assuming this could mean there is a collaboration in the mix for the two.
There is no definite word yet, but if all goes well, hopefully we will be finding out more information soon! I can already say I bet they would make some awesome music together!