Adrienne Bailon has lots of large body in her honey blonde style.  Deep waves have been applied to her length, probably by wrapping and clipping sizeable ring coils with product introduced, heat drying, then cooled to release in these huge S-curls.

A great way to "tame a mane" is to divide that massive long length into three workable sections that can be done with an extra large curling iron, yet a set lasts longer.   Adrienne Bailon demonstrates the results of twisting each side and the third section of the middle back (unseen) to later fall into this full volume look.  Brushed, clean, dry hair is twisted toward the back, the center back in either direction,and pinned up onto the head where it is spritzed with spray gel or other favorite product.   Dry (make sure it is completely dry) on low setting or under hood dryer, Cool using cool on dryer, (low fan) remove pins and fluff gently!

These two views of actress Adrienne Bailon's hairstyle show the movement as well as the dynamic look of her layered curly locks.   Her particular shade of honey blonde indicates the probability of artificial hair color applied to curly hair, giving the hair shafts more strength and durability, therefore helping to define each S-wave.  Curls were probably enhanced further with a curling iron that has an extra long barrel.