Horan hit the stage for the first time decked out in a pink suit and a white undershirt for a fun, upbeat performance of his new song, "Nice to Meet Ya."
Rocking a guitar and performing with a backing band and some simple stage design, the former One Direction singer treated his fans to a taste from his upcoming sophomore solo album -- his follow-up to 2017's Flicker.
Later in the episode, Horan took the stage again for a much more subdued and emotional performance of his new song "Put a Little Love On Me."
Ditching the light pink and white Miami-in-the-'80s vibe from his first set, Horan donned a simple black jacket with dark brown slacks and white shirt for this vocal showcase.
Horan also dropped in for a sketch with Johansson and Cecily Strong. The three played a trio of sleazy ghosts who died in a hot tub accident in the early 1970s, and now haunt that very hot tub.
Horan, who played a cigarette smoking, sideburns-rocking dude named Big Jim, sang about his fate, along with Johansson and Strong, in a bizarrely funny musical sketch that was a good match for Horan's personality.