"Lip Sync Battle" pits siblings against one another on Thursday when Julianne and Derek Hough compete. In a preview for the episode, Julianne Hough takes on Lonely Island's "I Just Had Sex," confirming to all skeptics that, yes, an "Saturday Night Live" spoof can actually be a legit song. Let's hope Akon shows up.
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Julianne Hough Through The Years