To give your straight hair messy, beachy waves, try this overnight recipe.

First, you need to start with the right product cocktail of lightweight stylers that have hold. Williams says to try a mousse, followed by a moisturizing cream. He recommends Phyto Professional Intense Volume Mousse, $24, and Phyto 7 Hydrating Day Cream, $29.

Then, divide your hair into four sections: ear-to-ear and top to the nape of your neck. Twist each section around a piece of cloth, then wrap into a bun and secure with a bobby pin. Grab a hairnet to keep your hair in place as you sleep. When you wake up, untwist your hair for "waves galore," says Williams. Flip your head over and gently shake and scrunch you hair -- don't even think about touching a brush -- and you're ready to go.

If you have straight hair, follow these tips for getting a sleek style that won't look greasy. Start with a moisturizing shampoo and conditioner.

Since straight hair tends to be oily, Williams says any product you use should be lightweight and only applied mid-shaft to ends (exception: volumizers, which should be applied at the root). Try a smoothing cream like John Frieda Frizz Ease Beyond Smooth Frizz Immunity Primer, $9.99. When hair is about 90 percent dry, apply a shine serum and then brush through your hair to further smooth it.

"Curly hair is usually dry hair therefore: moisture, moisture and more moisture," says Williams. He adds that curly hair must remain wet at all times when you're handling it, or it will get frizzy. Start by applying a hair cream that has some weight to it, but isn't greasy, to wet hair. (Try DevaCurl SuperCream Coconut Curl Styler, $28). Comb through once. "For curly looks with clear curl definition and elongation try this," says Williams. Grab medium-to-large perm rods or small hair rollers, and a fine-tooth comb.

"Making small to medium partings, about two inches wide begin at the nape and moving toward front (about nine rods later), braid hair and wrap around rods or rollers." When your hair is dry, remove the rollers, warm up more of your styling cream in your hands and pat onto sections of hair to unwind your curls. "This will hydrate and separate curls and wave."

"Tip: Do not comb, as hair will frizz. Only touch hair with cream on hands," says Williams. The less you touch your hair, the better.

To transform your wavy hair into a Giselle-status style, choose hydrating products that add hold without too much weight, like Living Proof Curl Defining Styling Cream, $28, as Williams says wavy hair can be prone to frizz and looking messy and poufy.

"The best air dry is to twist hair into a large bun or section into knots or braids," says Williams. "Avoid products with heavy oils, alcohol and waxes as these will weigh waves down, dry out waves, and cause hair to look sticky."

Potempa's recipe for gorgeous, air-dried waves starts with a volumizing mousse (we like Drybar Southern Belle Volumizing Mousse, $26). Work it through damp hair, and then create a deep side part. Divide your hair into four sections. Split each section into two strands, and twist the strands together so they're going away from your face. (Keep it loose so the texture won't look forced). Pin them in place at the back of your head and wait for them to dry.

"After you take it out you'll notice the hair twists and waves away from the face," Potempa says. "Shake out the wave with your fingers and spray with a texture mist to add more volume."