Cameron Diaz rocks a messy, top bun. Photo: Getty Images

Creating a sexy updo bun is easier than you think. You just need to tell your over-achiever self to chill and create a look that is fun, soft and maybe even a little messy. Celebrity hairstylist, Serge Normant, told Glamour.com, "No bun you create on yourself is going to be perfect, so you might as well play that up." Read on for his tips on creating the perfectly imperfect bun.

1. Tease it. "Use a fine-tooth comb to gently tease the top and sides of your hair, and a little at the crown. Tease just the roots, starting about two inches from your scalp and working from the front of your head to the back. When you're finished, use a paddle brush to gently smooth any tangles in your hair."

2. Pull it back. "Sweep your hair back using your hands-not a brush-so there's no part, and loosely gather it all at the nape of your neck. Secure into a low ponytail with an elastic band placed about a half-inch away from your scalp, which will help to keep the volume you've created on the top and sides of your hair intact."

3. Twist it. "Tease the underside of the ponytail using the fine-tooth comb, then skim over the top of the ponytail with the paddle brush. When finished, grasp the tail by the end and wrap it around the base of the ponytail clockwise until it creates a chignon; tuck the ends under the bun so they're hidden."

4. Secure it. "Take a long, U-shaped hairpin and bend one prong to the side (the serpentine shape will create a hook), then slide the pin into the bun where the ends are tucked. Repeat on the opposite side. If the chignon still feels loose, add one more bent pin at the top or bottom. Mist with aerosol hair spray."

Remember, the goal is not to create a look that is reminiscent of your third grade teacher. Play with different variations, try braiding part of it, add some cute accessories and let your bun be loose -- a few falling strands will only make it look more natural. Most importantly, have fun with it!

Want more variations for your updo? Check out the latest Hollywood looks!