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Justin has been keeping in touch with Kim Kardashian‘s sister Kendall, 15, behind Selena’s back, Life & Style Weekly reports.

“Justin calls Kendall a lot, and it all started when Selena went on tour,” a source close to Kendall says. ”Justin is completely infatuated with her. He had a little-boy crush on Kim last year, but he’s obsessed with Kendall now. She’s hot!”