The former boy bander pulled double duty as both SNL host and musical guest.
The singer andDunkirkactor also performed the brand new song live during his final musical performance of the night.
The song was released in October along witha bacchanalian music video.
Will Heath/NBC
He joins anexclusive group ofSNLhosts who have also been musical gueston the same episode.
The tour will kick off in the U.K. in the spring before heading stateside in the summer.
Watch both of StylesSNLperformances from this weeks episode above.
