"I keep on changing my mind," says the reality star, who's engaged to Kris Humphries

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Kim Kardashian found the man of her dreams in fiancé Kris Humphries. And when the NBA star proposed last month, he popped the question with a sparkler straight out of her childhood fantasies. But while Kardashian’s path to a fairytale wedding may seem simply charmed, her quest for the perfect wedding dress could prove to be anything but. What exactly is the fashionista’s vision for her most important dress ever? “I keep on changing my mind,” the reality star told PEOPLE Tuesday. “I definitely want something custom, and it’s going to take time to get sketches and all of that.” Kardashian may have dreamed of her perfect ring since high school, but her wedding dress appears to be another matter. “There’s nothing really that I saw in [my] mind,” she says. “So I really have to buckle down and just sit and figure it out.” There’s no time to lose for the starlet, who says she’d like to wed this summer. “There’s so much to do that I just feel like, ‘Oh my God, I better get going!'” For now, the bride-to-be is focused on promoting the sixth season of Keeping Up With the Kardashians, which returns to E! June 12, and basking in the afterglow of an engagement trip to Monaco with the Humphries family. Admits the bride to be: “I haven’t even thought of the dress yet!” —Jessica Wedemeyer