SEE ALSO: SISTAR reveal surprising facts about themselves on 4th episode of their 'Oven Radio'

All of the SISTAR members became the main DJs for this episode and tested out their 'BFF loyalty' by calling their celebrity friend who turned out to be a fellow idol! Soyu pulled a hidden camera prank on her friend by pretending like she was in an emergency at the club. Dasom also showed her funny dance version of "Touch My Body".

Find out who their celebrity friend is by watching the episode above!