There's nothing quite like a flashy dress for a holiday party. Sierra, one half of The X Factor Season 3 winning duo, just opted for Topshop's short sleeve green and blue sequin velvet dress at the finale celebration on Thursday night in Los Angeles. She capped off the look with black sandals.Although the sparkler is a bit on the short side, it's a great way to show off a festive pair of footwear. You can score Sierra's sequin creation for just $136 and ring in 2014 in style.