When the show ended, people who were said Louis had to carry Kelly, who was in tears, off the stage.
Kelly's publicist said Kelly went to the hospital after the show to get her foot checked out.
"You never want to be overconfident but I've got to tell you something: I needed this tonight," said Donny Osmond. "I needed this to build the confidence."
For their Argentine Tango, Donny and his partner, Kym Johnson, got a near-perfect 29 out of 30 from the judges. The bonus? Donny liked that judge Carrie Ann Inaba called his performance "sexy."
"I'm buying every bit of it because I want to buy it," said Donny. "I'll take out a loan to buy that one."
Mya and her partner, Dmitry Chaplin, came in second place doing the same dance. For Mya, this was a tough one.
"You will see a bunch of bruises on my back and my legs, but it's OK," said Mya. "It was worth it. I learned a lot. I've never done anything like this before and I think this was the hardest dance and we got through it."
Mark Dacascos had his best week yet with the Paso Doble. He and partner, Lacey Schwimmer, landed in third place and on cloud nine.
"I'm so jazzed today because we did have a breakthrough and I'm so thankful for her choreography and just her patience and I just loved that dance," said Mark. "It was a good night."
There was a three-way tie for fourth place: triple eights for Aaron Carter and Karina Smirnoff, Kelly Osbourne and Louis Van Amstel, and Joanna Krupa and Maksim Chmerkovskiy, filling in for a flu-stricken Derek Hough.
"It's in the stars that Derek and her are going to do great," said Maksim. "And, you know, I think audience loved our performance today and given the circumstances, she did an amazing job."
Melissa Joan Hart came in seventh this week.
The athletes are at the bottom of the leaderboard. Swimmer Natalie Coughlin tied for eighth with snowboarder Louie Vito, and one point behind them, in last place, football star Michael Irvin.
Before someone goes home Tuesday night, the professional dancers do a tribute to Michael Jackson during the results show.