Leave it to the music biz to turn out an outrageous red carpet at the Billboard Music Awards. On Sunday night, the arrivals skewed toward attention-getting and sent tongues wagging with one common denominator: the sexiest looks were all sheer. Stars like Hailee Steinfeld, Olivia Munn, and Rita Ora slipped into see-through looks, pretty underthings, and not much else. Read on to see the looks that left a lasting impression.