Taylor Swift looked stunning as she made her entrance at the Billboard Music Awards in Las Vegas today. She wore a sparkly, strapless gown and red lips. The singer just tweeted that she's "about to go find my seat. Got 'Waking Up in Vegas' stuck in my head, @katyperry," and prior to today's event she had just played a show in Nashville. She's up for a whopping seven awards including top artist, where she's up against Justin Bieber, Eminem, Lady Gaga and Rihanna.