Welcome back, Hilary Duff ’s Dignity era. The pop star’s long-awaited return to music came with an unexpected revival of her moodiest album. When Dignity was released in 2007, Duff had recently broken up with her boyfriend Joel Madden. And now, on her new release “Mature,” Duff seems to be delving back into to that relationship, at least partly. But the song isn’t bothering Madden at all.

In “Mature,” Duff reflects on a past relationship that had a significant age gap. In the chorus, Duff marvels at the new young girlfriend her older ex has moved on with: “She looks / Like all of your girls but blonder / A little like me, just younger / Bet she loves when she hears you say/ ‘You're so mature for your age, babe.’”

Duff revealed the lyrics are about an experience she’s had in the pas

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