"Case of the Ex" is a song by American singer Mýa. It was written and composed by Christopher "Tricky" Stewart and his songwriting partners Traci Hale and Thabiso "Tab" Nkhereanyne for Mýa's second studio album Fear of Flying (2000). The up-tempo pop and R&B track was inspired by a relationship Hale was going through at the time. It was released as the second single from the album, following "The Best of Me", on July 11, 2000.

Mya Marie Harrison is an American singer, songwriter, dancer, record producer, and actress. Classified as a "triple threat entertainer," she was born in Washington D.C. and studied ballet, jazz, and tap dance as a child. Her career began in television as a dance posse member, performing on BET's Teen Summit. She signed with record executive A. Haqq Islam's University Records, an imprint of Interscope Records to release her eponymous debut studio album (1998), which lyrically explored romance and coming-of-age scenarios. Met with critical and commercial success, the album was led by her first single, "It's All About Me", which peaked within the top ten of the Billboard Hot 100. Her collaborative singles — "Girls Dem Sugar", "Ghetto Supastar ", and "Take Me There" — were also met with commercial success.