S4, the winners of the Korean-Indonesian audition show "Galaxy Superstar Season 1," are gaining quite a bit of attention after releasing news that 4Minute's HyunA will be on their debut album.

HyunA, who recently released her second mini album, Melting, will be rapping for the song, "She's My Girl" which is an upbeat dance track composed by Kim Do Hoon.

S4 has been training in Korea since September and will hold their debut stage on October 31 in Jakarta at the 'Volume Up Party' which will also feature 4minute.