This week's 'M! Countdown' featured a highlight special for 2015!

SEE ALSO: ADOR issues a full-length official statement refuting each of HYBE's accusations

On this episode, SISTAR's "Shake It" went head-to-head against fellow girl group AOA's "Heart Attack", but it was SISTAR who took the final trophy! Congratulations to SISTAR!

Check out SISTAR accept the award below!