"Star King" entertainer Kim Na Young and Girls' Day's member Minah fell on their butts.

In SBS "Star King" aired today, Girls' Day's Minah and Kim Na Young was trying the robot dance that the robot dance world champion showed, but the dance competition ended only in both of them falling on their butts.

Kim Na Young and Minah heated up the stage with the hip dance and powerful chest popping, but only until they went onto holding each other on their backs.

Kim Na Young's legs on high heels let go and Minah who was on her back fell with a loud thump.

Minah couldn't hold up her head for a while because of embarrassment, and MC Kang Ho Dong said, "That was the worst performance in the history of Star King," arousing laughter.

Photo Credit: SBS