The final five contestants on 'Dancing With The Stars' had to battle it out in an 'instant dance' challenge last night (09.05.11).

Kirstie Alley, Ralph Macchio, Hines Ward, Romeo and Chelsea Kane found out what numbers they had to perform to just moments before taking to the stage on the talent show.

Disney presenter Chelsea came out on top of the scoreboard, receiving two 10s and a nine for her romantic waltz with Mark Ballas.

Judge Bruno Tonioli exclaimed: "You've finally found the perfect dance for Chelsea to shine!"

Meanwhile, it wasn't Ralph's week, with the 'Karate Kid' actor left frustrated after his knee and calf gave out during his routine, which achieved a disappointing seven from each of the judges.

He said: "It can't end this way."

Kirstie also suffered some mishaps, tumbling during her performance and later said she hadn't eaten enough to keep her energy levels up.

The Jenny Craig spokeswoman is on a strict 1,400 calorie diet and admitted: "I just forget to eat".