Madonna may not be getting any younger, but her style sure seems to be.

The fifty-something singer's edgy ensemble at the opening of Hard Candy Fitness in Mexico appeared to have been plucked straight from daughter Lourdes' closet.

She topped off her look, which included a graphic tunic, over-the-knee boots and studded belt, with dog collar chains. Woof!

Photos: Kevin Mazur/WireImage