Remember Santa's workshop? Well, this holiday season, Barneys is taking a spin off of the classic fairy-tale term with one of its own: Gaga's Workshop. That's right, the retailer is teaming up with Lady Gaga to create a holiday popup store — which will take up the whole fifth floor at the Madison Avenue flagship and in the store’s iconic windows — featuring all things Gaga, such as limited-edition gifts created by the star and Mugler creative director Nicola Formichetti in addition to books, CDs, toys, accessories, makeup, and candy all curated by the eccentric performer herself. The gift selection is said to range from kids to adult categories, so there's something for every Gaga fan. Addionally, 25 percent of all sales from Gaga's Workshop will go to a charity of Lady Gaga’s choice.