Derek Hough Had To Watch His Sister Pole Dance!

Ewwww! LOL!

We know Derek and Julianne Hough are close, but no brother and sister should be THAT close!

Don't worry though, it's not as disgusting as it sounds.

It turns out, the Dancing With The Stars pro bro stopped by the set of Rock of Ages to visit his sis and he just happened to be on set during a scene set in a strip club. He told sources at movie's premiere on Friday night about the awkward incident and explained:

"I was just there visiting, and I walked in and Adam (the director) was like, 'Sit down there.' It was just funny because once she started dancing and doing the whole thing, I was like, 'I think I'm going to go now.'"

Yeah...that was probably for the best. Ha!

We bet Ryan Seacrest would have enjoyed that scene though!