I love Christina Aguilera so much, and I have followed her news for a long time.
Her eyes are natural blue, like a Barbie.
Plus, she does wear cosmetic contact lenses. However, they are not blue, she has no need to wear blue contact lenses.
In the 2011 the voice recording session, she wore a pair of gray contact lenses and a pair of brown contact lenses.
In her new album, this year, she wore a pair of pink contact lenses.
You can have a look at her album and pictures.
Well, it seems that you like christina aguilera very much. So, as a matter of fact, she is an American fashion singer who is widely recognized for her sexy looks and nice music. So, you should know that she has got a pair of blue eyes from her birthday, so she doesn't need colored contacts, maybe sometimes she would prefer contact lenses to see things clearly, but she does not wear colored contacts.
Yes, it is true that christina aguilera wears the blue contact lenses. In the formal interview, her eyes are brown. Then I searched her pictures in the childhood and young age. It is the brown eyes that she is born to be. Thus, she wears the blue contact lenses to make her look beautiful and attractive. In addition, the blue contact lenses are received high welcome among the women.