1. To copy Jess's glam style, apply a volumising mousse to damp hair. Coating the mid-length to ends isn't enough; you really need to work it in from root to tip for best results.
2. Straight hair: Blow-dry it upside down until totally dry, then flip hair up and comb it into a middle part.
Curly Hair: Blow-Dry straight in 10cm sections with a round bristle brush
3. Next, tong 3cm sections of hair using a large barrel hair tong, starting at the front and working your way to the back.
4. Now, brush hair gently with a natural bristle brush. If you;re worried about frizz, just loosen each curl with your fingers.
5. Finish with a light spritz of hairspray but make sure you hold the can as far away as possible to prevent that 'crunchy' feeling.

And volia! Instant Jessica Alba godess hair... Enjoy!