Spike TV/Viacom
Don't worry, Derek Hough, it's not as though you just saw your sister actually having sex.
But the look on the Dancing With the Stars pro's face is pretty priceless as he watches Julianne Hough giving it her all to the tune of "I Just Had Sex" in this sneak peek at Thursday's new episode of Lip Sync Battle.
Clad in booty shorts, a cropped sweater, stockings and over-the-knee boots, the fairer Hough gyrates and out-raunches the hilariously raunchy Lonely Island song with aplomb, two shirtless dancers upping the showmanship alongside her.
What brother doesn't want to see his little sis gesturing at her crotch while lip-sync-rapping, "It felt so good when I did it with my penis"?
Watch and laugh—and, unlike Derek, don't cover your eyes!