Hilary Duff 's music career is no longer so yesterday.

The Lizzie McGuire star released her first new song, "Mature," in over 10 years on Nov. 6—and the track was accompanied by a music video that introduces the more grown-up era for her.

In the Lauren Dunn -directed clip, Hilary—clad in a gold mini dress with frill detailing and coordinating fur coat—gets ready in a vanity mirror, applying lipstick, fixing her hair and admiring a bouquet of pink flowers on her dressing room table. And when she finally takes the theater stage to perform atop a white circular daybed, there's only one person in the audience: herself.

"She looks like she could be your daughter / Like me before I got smarter," Hilary sings on the chorus. "When I was flattered to hear you say / You're so mature for y

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