Take two invisible elastic bands and separate the hair into two ponytails, one above the other, in the back of your head. Once the ponytails are secured, take sections of each ponytail and, starting at the ends, roll them toward the head, pinning them in place with bobby pins. Roll the top ponytail first, then the bottom, leaving pieces closest to the middle for last.
The Perfect Messy Bun in 3 Steps - This works if you have dirty hair. I did it without teasing since the previous night I had my hair in a bun with day old hair for several hrs and after letting it out it was very curly and slept with it then later the next day fought the urge to comb it to try this style :P
Party Hair Inspiration: 10 Gorgeous Messy Updos From Pinterest
This is good idea. I'm just guessing how this was done. She put braids on each side behind the ear, then overlapped braids, and secured with hair pins underneath. Make a bun on the bottom. Hair spray all over. Will try it sometime to see if my guess is correct.