The hairstyle you should wear tonight is Katherine Heigl's glammed-up side bun

This is the perfect style for a big holiday bash or fancy winter occasion.

Here is how Lamas recommends copying this look:
Step 1: Start by rolling clean, dry hair into large velcro rollers.
Step 2: Set hair dryer on its lowest air setting to gently heat up hair without disturbing the rollers and let hair cool before removing the rollers.
Step 3: Use your fingers to break up the curls to achieve loose waves, then gather hair loosely at the nape of the neck and slightly to the side. Secure with a hair elastic.
Step 4: Working with the ponytail you've created, separate hair into thick sections and tease each section. Then wrap each section into a curl (by wrapping them around two fingers) and bobby pin the ends around the ponytail base gradually forming a loose bun. Mist with strong-hold hairspray like TRESemme Tres Spray Super Hold Hairspray, $3.99.
Step 5: Complete your look by pinning on a jeweled barrette or broche for a fancy finish.