Sunday shoppers, rejoice: Celebrity stylist Kate Young's collaborative collection for mega-retailer Target hits stores and target.com today! Fans of the eclectic line already include stars like Michelle Williams, Maggie Gyllenhaal, and Kate Mara, who all wore her designs to the collection's prom-inspired New York launch party this week. "I’ve seen a lot of the pieces from the collection and they’re all really, really different," Mara told InStyle.com at the launch. "I was choosing between this dress and another dress that doesn’t even look like it was by the same designer, but both equally beautiful. I really appreciate that." The creator herself shared her secret favorite piece from the collection with InStyle: "I’ve had a long relationship with these clothes at this point, and I think probably my favorite is the bodysuit because it’s so versatile," Young said of the polka dot suit. "I like to wear the bodysuit under a blazer [like Michelle did]. I also like to wear it under a dress like I am now." So fun! Click here to see a full preview of the line, and head to target.com to shop the collection now.