Kendall and Kylie Jenner looked happy and relaxed while walking the red carpet at the Billboard Music Awards on Sunday ahead of the Keeping Up With the Kardashians: About Bruce special. Kendall spoke with E!'s Giuliana Rancic about the highly anticipated special airing tonight. "Honestly, I've never seen him happier," she revealed. "That alone makes me so happy. To see him so happy and to see him going through this and staying so strong and really thinking about his kids is amazing." Kylie then walked the red carpet but didn't appear to give any interviews. Part one of the E! special premieres Sunday, May 17, at 9 p.m., with part two following on Monday, May 18, at 9 p.m. And if you can't get enough of the Billboard Music Awards, check out all of the stars on the red carpet.