In this recent photo of her we have the urban hipster version of Christina Aguilera. Sunglasses are in the forefront of this get-up and the colour is very intentional.

Chritina Aguilera Latest Hairstyles
Christina is wearing Super Sunglasses White Super Classic. Started in 2007, this brand has exploded with popularity. They've got a new set of sunglasses out now, but this classic works great here. The price is about $130USD.