The easiest way to take your style from daytime to dressy is by sliding on a bling-y headband similar to the one Emily Blunt pairs with a low ballerina bun here.

Next: See how to get the look

A bun is an easy, go-to look for day because you don't have to wash your hair � and actually shouldn't since the oils will help hold your hair back. If your strands are squeaky clean though, just run a hair cream like Moroccanoil Hydrating Styling Cream, $30.63 through it to "dirty" it up a little.

Next: See how to finish your look

Put the finishing look on your style at the end of the day, before your holiday shindig, by slipping on your headband. Have it rest a half-inch from your hairline.

Last, set your style with a light-hold hairspray like Fekkai Coiff Sheer Hold Hairspray, $23.

Emma Stone transforms from girl next door to red carpet glamazon by simply pulling two small side sections of her hair back. This half-up style is a cinch to do (even in your office bathroom) before a party if you've been wearing your hair down all day.

Next: See how to get the look

To start, spray your roots with a volumizing product.

Next, smooth the front and top portion of your hair using a blow dryer and medium-sized round brush -- the heat will work with the volumizing spray to add lift to your hair. Before pinning your hair back, backcomb the crown of your head (just a bit) to add additional volume. Backcombing refresher: take a one-inch section and hold it up, then place a fine-toothed comb or brush into it from the top and push down, pull it out, and repeat. Then smooth out the top layer gently.

Last, grab a section of hair from each side of your head, above your ears, and pull them back (leave bangs or a few face framing layers hanging in front). Then secure the two sections to the back of your head with two bobby pins -- crisscross them so they stay in place.

Next: Learn how to set your style