The women of Hollywood kept things chic and ladylike this week. From glamorous gowns to cute day dresses, there was no lack of star style. Red carpet queen Jennifer Lopez got the final season of "American Idol" off in full swing with an A+ auditions outfit. JLO listened to show hopefuls in Arkansas this week in a pretty pastel Alex Perry number. The sexy starlet expertly paired her winning look with Louboutins, a sleek top-knot, and a pale pink lip. Model turned actress Emily Ratajkowski showed off her curvaceous assets in a Maria Lucia Hohan gown fit for a Grecian goddess at the 'We Are Your Friends" premiere in Los Angeles. Powerhouse singer Celine Dion made her way back to the big stage in Las Vegas, in a glittering Zuhair Murad gown. If you are going to wear floor length sequins, there's no place better than Sin City. Southern lady Reese Witherspoon continued to wow us with her sassy street style. The blonde beauty paired a sunny J.Crew skirt with a a blouse from her very own Draper James line, she paired the pieces with Prada sandals and a covet-worthy Saint Laurent bag while our and about in L.A.. The one thing all of this week's Top 10 looks have in common, is you can always look sophisticated and well put together. From a swanky event, to just running errands around town. To see our full collection of looks please visit our Best Dressed gallery above.