Christina Aguilera has reportedly canceled her upcoming 20-stop North American tour, scheduled to run from July 15th to August 19th, and will reschedule the dates for 2011. The pop superstar's new album, "Bionic", is due to hit stores June 8th, and promoters say that there simply wasn't enough time for Aguilera to rehearse and prepare for the trek. Any tickets purchased for the canceled dates will be refunded at point of purchase, and the rescheduled dates will be announced later this year.