If your hair is long:

Wash hair and apply Fekkai Volumizing Mousse to the roots of towel-dried hair.
Pre-dry the hair, flipping your hair upside-down, with a back and forth motion, using your fingers.
After hair is dry, flip you hair back and blow-dry the hair to smooth out the ends with a Fekkai Large Round Brush.

Flipping hair upside-down again, pull hair up, as if you were going to put it in a high ponytail, this way you will achieve the height needed for this look. If your hair is fine, tease the crown for extra volume.

When the hair is in a high ponytail, leave a stray piece to wrap around the elastic.
For a bun, sweep the hair up as you would a ponytail and wrap around securing with bobby pins. Twist any access hair and secure.
Spray with Fekkai Sheer hold Hairspray.

If you hair is short, you will want to try and achieve a modified mohawk.
Wash hair and apply Fekkai Texturizing Gel to towel-dried hair.
Follow the same steps of pre-drying and drying the hair.
When finished, tease the crown to create lift and slick the sides back with Fekkai Pomade Cristal. You want it to be sleek on the sides and voluminous on the top.
Finish with Sheer Hold Hairspray.

Voila! Sex kitten hair in just a few minutes.