"Teenage Love Affair" is a soul–R&B song written by American singer-songwriter Alicia Keys, Jack Splash, Matthew Kahane, and Harold Lilly for Keys' third studio album, As I Am (2007). Released as the album's third single, it is produced by Keys and Splash and is based around a sample from The Temprees' 1972 song "(Girl) I Love You," written by Josephine Bridges, Carl Hampton, and Tom Nixon. The song ranked number twenty-three on Rolling Stone's list of the 100 Best Songs of 2007. It impacted mainstream urban radio on April 21, 2008. Keys performed the song on Late Show with David Letterman on April 29, 2008.
Swizz Beatz produced a remix of "Teenage Love Affair" featuring LL Cool J, using a sample from Slick Rick's 1988 song "Teenage Love" on it.
According to Keys' official website and official fan club, the music video for "Teenage Love Affair," directed by Chris Robinson (with whom she had previously worked with on 2001's "Fallin'" and 2003's "You Don't Know My Name," among others), was filmed at Drew University in Madison, New Jersey. Derek Luke plays Keys' love interest, and Anthony Hamilton, Jackie Long, Albert Daniels, Tristan Wilds, and Tanisha Scott make cameo appearances in the video as well. The video is based on Spike Lee's 1988 film School Daze, starring Laurence Fishburne, Tisha Campbell-Martin, and Kyme, among others. The video premiered across the U.S. on April 23, 2008 on MTV's TRL. That same day, Keys also appeared on BET's 106 & Park to premiere the video.