The Voice coach posted a brunette photo on social media teasing her upcoming appearance on the Music City soap

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Who says blondes have more fun?

Christina Aguilera posted a conversation-starting new brunette pic on her Instagram Monday night that would beg to differ.

We’re guessing it’s just a wig, though, since the Voice coach, 34, captioned the shot: “Look at all that hair! Having lots of fun on the set of #Nashville. More to come!”

Though no date has been announced for her guest appearance on the Music City soap, Aguilera previously told 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.”

Nashville airs Wednesdays (10 p.m. ET) on ABC.