Kate's old roommate, Jessica Hay, apparently said that the duchess used to have a poster of the royal heartthrob—aka her now husband—taped up on their shared wall at boarding school. "She would joke, 'There's no one quite like William.' " Hay reported that Middleton would say, according to royal expert and biographer Katie Nicholl in her book Kate: The Future Queen, per Marie Claire.
For her part, though, Kate vehemently denies her high school crush on the future king when the rumor got back to her. And according to Nicholl, Kate had other things on her mind back in high school aside from landing herself a prince, though she would eventually wind up dating one when they were both students at the University of St. Andrews (and later, obviously, marrying him). "Indeed, when William came to Marlborough for interschool events, Kate was more interested in playing hockey than waiting at the goal line on the hockey field above Wedgewood, where some of the girls congregated to gawp at the prince," Nicholl wrote.
"Others would gather outside Mill Mead, where the buses parked, so they could chase after the boys as they drove off. But not Kate."
William, though, would like to believe that there is some truth behind the story. "She had 10 or 20 pictures of me up on her wall at university," he said in their engagement interview. But Kate laughed off the story in her first-ever interview: "No, it was the Levi’s guy on my wall, not a picture of William. Sorry!" she replied. "It was me in Levi’s," he joked.
...Either way, it all worked out!