To get a sleek ponytail just like Rosie, you want to use products that will smooth the surface of your hair to add shine without comprising on volume. Rosie uses a small amount of mousse worked through damp hair, followed by a spritz of leave-in conditioner. This combination means that your ponytail will look full, bouncy and glossy. Next, use a round hairbrush to blow-dry your hair to add movement at the roots and to help close your hair's cuticles to add extra shine.