The Lip Sync Battle continues with the sibling rivalry Derek Hough and sister Julianne Hough. Derek Hough performing a dazzling rendition of "Chandelier" by Sia. Julianne Hough brings the battle to a traumatizing close with "I Just Had Sex" by The Lonely Island. Derek is an American professional latin and ballroom dancer, choreographer, actor so this is definitely show be a breeze for him. You probably remember Derek from Dancing with the Stars of which he has won a record five seasons. But let's no forget his beautiful sister Julianne a American dancer, singer-songwriter, and actress. Julianne is a two-time professional champion of Dancing with the Stars. Derek shocked me with his amazing performance of Sia Chandler I really thought Sia was on stage. Julianne is looking gorgeous in her red and black outfit and those dance moves make you just want to watch this on repeat.