"Diva" (Korean: 디바) is an electro dance song by South Korean girl group After School. The song was released on 9 April 2009 as a digital single and later added on the group's second single album Because of You as B-side. The song is the first release including Uee and the last release including Soyoung, who withdrew from the group to become an actress.
A Japanese version of the song was released on 23 November 2011, serving as the group's second Japanese single. An original Japanese song "Ready to Love" was released with the single.
"Tap Slap" is a Japanese instrumental version of the song "Let's Step Up", included on the group's first album Virgin. The Korean version of "Diva" included on the Japanese single is a new version. It used the Japanese instrumental for the version and included the members Nana, Lizzy, Raina and E-Young.