Donnie's dance partner for the last few seconds of Step by Step, Peta Murgatroyd, posted this of rehearsal via Wetpaint on youtube. (did any of that make sense?) it doesn't matter really..just enjoy the video of NKOTBSB rehearsing. :)
If for some reason it's only showing 1/2 the screen...hover over the screen until the top bar rolls down, then click on it and it will take you to You Tube so you can see all!