Uh-oh! We wonder what Amber Riley will have to say about this!
So who was his dance partner for the evening? Why it was none other than the gorgeous Kate Hudson!
Ok, so actually there's nothing scandalous at all about this. Especially since we already knew that Derek was giving Kate private dance lessons!!
It definitely looks like they paid off too, as the duo absolutely stole the show and worked the dance floor in front of a very surprised audience!
Unfortunately, Derek has already said that there's NO way Kate would ever do DWTS, which is a shame because she has some serious moves, which you can see HERE!
[Image via Nikki Nelson/JP/JFXimages/WENN.]