Joining St. Lucia across Fata Morgana is pop duo Aly & AJ, who are featured vocalists on the spiky “Campari Lips & Soda” and contribute vocals across the record as well. The collaboration is the result of an inspired writing session the band had with Aly & AJ near the end of 2019 back in NYC: “I’ve really enjoyed watching their own musical career develop,” Grobler stated about his admiration for the pair. “We’ve never really had features on any of our tracks before, but this happened naturally and it just felt right, so we went with it.”