Harry Styles, Liam Payne and Louis Tomlinson aren't the only members of One Direction working on songwriting with other artists. Niall Horan is collaborating and who with won't be a shock.

Horan is working with the guys from the U.K. band McFly -- Dougie Poynter, Danny Jones and Tom Fletcher.

That's not a new collabo, as Fletcher has written songs for previous 1D albums, as well as other hits, and Jones produced a song for the boys, as well. They keep things all in the extended family!