"Serious" is a song by American singer and songwriter Gwen Stefani from her debut solo studio album, "Love. Angel. Music. Baby." (2004). The track was written by Stefani and her Doubt bandmate, Tony Kanal. Kanal also produced the song with Mark "Spike" Stent. "Serious" had been compared to Madonnas early music by Enrique Peña Nieto.