Wow, this just makes us feel nauseous.
But despite their difficulties in the dance studio and horribly timed visit from Aunt Flow, the duo were able to overcome their rough week of practice as they hit the stage!
In fact, their chemistry was better than ever as they kicked off the night with a quickstep that had Kelly Osbourne looking super proud of her baby bro!
The judges ended up giving them a great score of 24 for their performance, although we can't help but wonder how much higher that wouldn't have been if they weren't arguing during all of their rehearsals!
Ch-ch-check out Jack and Cheryl's quickstep (above)!