Entertainment TV Julianne Hough Embarrasses Her Brother with Sexy 'Lip Sync Battle' (VIDEO) Derek Hough hides his face as his sister and Dancing with the Stars judge performs "I Just Had Sex" By Wade Rouse Published on May 12, 2015 08:55 AM Share Tweet Pin Email Photo: John Lamparski/WireImage We know Julianne Hough can dance, but how well can she embarrass her brother, Derek? Turns out she’s a pro at that, too, as this clip from the upcoming Lip Sync Battle proves. The 26-year-old Dancing with the Stars judge got plenty of judgment from her older brother after she performed a rather risqué version of “I Just Had Sex” by The Lonely Island. The five-time Mirrorball Trophy winner – who’s used to doing a bit of dirty dancing himself – shot a shocked look at the performance before covering his eyes and ducking his head the further his sister goes with two shirtless dancers backing her up. Lip Sync Battle airs Thursdays (10 p.m. ET) on Spike.