Hilary Duff didn’t just give us an infectious pop gem with her long-awaited musical comeback — she also dropped some juicy lyrics for listeners to decode. On her new single “Mature,” Duff sings about a past experience with an older partner. And although it may sound like she’s taking shots at Nicole Richie in the chorus, the socialite is making it pretty clear why that’s not the case. Or, even if it is, Richie is so not bothered by it.

The telling lyrics of “Mature” have resurfaced the interest in Duff’s most infamous age gap relationship, when she dated Joel Madden from 2004 to 2006. The romance began when Duff was 16, and Madden was 25. Shortly after they broke up, Madden moved on to start dating Richie. That pair has remained together ever since, and are now married with two childre

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