Like Matt Willis, Kenzie, and Kerry Katona before her, singer Alesha Dixon became a household name not through her dance-pop music, but thanks to an appearance on a reality show. One of seven children born to an English mother and Jamaican father, Dixon grew up in Welwyn Garden City and initially planned to become a P.E. teacher. After completing a diploma course, she was about to take a position at Loughborough University when she was approached on a train by a record producer, who asked if she...