Madonna debuts a new, fast-fashion junior collection exclusively at Macy's this August called "Material Girl," and the Material Mom tells ET that her daughter Lourdes serves as her muse for the collection!

"I've used fashion to make statements through my work all my life and now I have a 13-year-old daughter who's obsessed with fashion, so it seems like the natural progression of my life," she says. "If you're a Material Girl, you're a girl with a sense of humor."

The Material Girl collection consists of edgy apparel, footwear, handbags and jewelry, all inspired by music and much of Madonna's early fashions, with plenty of studs, layering and lace -- and even a bustier.

"I trust [Lourdes] because she has great style," Madonna tells ET, adding that her daughter makes most of the decisions about the collection. "We rarely disagree when it comes to clothes, I have to say. That's why most of my closet is being raided on a regular basis."

Watch ET Monday for more of Madonna's interview!