See all the celebs who have made surprise appearances on Taylor Swift's '1989 World Tour.'
While we may not know for sure if Selena Gomez and Zedd are an official couple, it looks like we might be hearing their musical collaboration any day now.
Harry Styles has been broadening his career recently, with collaborations in the works with both Ariana Grande and Ryan Tedder. While the 1D boy bander will always be a beloved member of One Direction, we're super psyched to hear his upcoming collabs with these A-list pop stars. Which Harry Styles collaboration are you most excited for?