Madonna is the second mini-album by South Korean girl group, Secret. The mini-album was released on August 12, 2010, and contains five tracks. "Madonna" was being used as the promotional song for the mini-album. The song debuted at number 1 on South Korea's Gaon Singles Chart.
The mini-album debuted at number 5 on the Gaon Album Chart on August 12. "Madonna" was released in Japan on August 3, 2011.
"Madonna" was first used as a promotional track from the album. On August 5, 2010, a teaser video was released online. In the teaser, the girls were performing the album track "Empty Space". Empty Space is a ballad track that was composed by Kang Ji Won, Lim Sang Hyuk and Kim Ki Bum. The song expresses the feeling of having a hard time forgetting the lover that left, thus leaving one with an ‘empty space.’ This track is unique, as it is composed of only piano sounds and vocals. The final music video premiered on August 12, 2010 along with Madonna's release. Secret had their debut performances of "Madonna" on Mnet's M! Countdown, KBS's Music Bank, MBC's Show! Music Core and SBS's Inkigayo from August 12 to August 15.