Connick worked on this feel-good, upbeat track with producer Eg White, known for his work with Will Young and Florence + the Machine. The song came about when White suggested they do a lively tune, and the two started clapping and improvising the track.
Regarding the meaning of this song, Connick said: "It's the feeling you get when somebody you find attractive smiles at you and really means that smile."
Connick steps out of character and does a rap in this song, demonstrating a fairly impressive flow and a deft lyrical touch, calling the girl an "emotional defibrillator."
It was never a big hit, but "She's A Rainbow" became one of the most popular Rolling Stones songs in the digital age when it started showing up in commercials (iMac, Photoshop), and TV shows (American Horror Story: Coven, Ted Lasso).