“A Mess (Happy 4 U)” is the ninth track off Little Mix’s sixth studio album Confetti.

The song talks about seeing your ex with someone else after breaking up with them and being hurt by it, since you’re still in love with them. However, you’re trying to be the bigger person and be happy for your ex and their partner, while secretly feeling heartbroken. Even though the lyrics are sad, “A Mess (Happy 4 U)” is, melodically, considered a happy song.