Christina Aguilera may be famous for her big voice and blonde hair ... but the singer went BRUNETTE for her guest star appearance on "Nashville."
Xtina posted a preview photo of her "Nashville" look, and it shows her sitting down in her chair on set with long brunette curls spilling over the back. Christina captioned the photo, "Look at all that hair! Having lots of fun on the set of #Nashville. More to come!"
The new hair 'do could be just a wig, but we're sure she looks fabulous in it either way!
