What is ‘the’ hairstyle pick for this summer? Celebrity stylists have informed StyleBell that celebs are running with the half-up half-down hairstyle. With stars like Fergie, Paris Hilton, and Hillary Duff sporting this casual, sexy, and incredibly romantic style we of course have to agree! We love this style as it works for both day and night and is super simple to recreate! Check out our slide show for more celebrity half-up half-down styles.