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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 to Instagram 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!

Look at all that hair! Having lots of fun on the set of #Nashville. More to come! 👸🌟👸

A photo posted by Christina Aguilera (@xtina) on

The date of Christina's "Nashville" episode has not been announced yet, but she did tell The Hollywood Reporter:

"My character is a successful pop singer who desperately wants to move into the country world, as that is her true passion. But she is caught between her passion and what the label wants her to do." 

We can't wait to see it!