Photos: Celebrity siblings
Julianne and Derek Hough
LOS ANGELES, CA - JANUARY 15: Singer Julianne Hough and Dancer Derek Hough attend the 2011 Art Of Elysium "Heaven" Gala held at the California Science Center on January 15, 2011 in Los Angeles, California. (Photo by John Shearer/Getty Images for Art of Elysium)
