Bruce Springsteen may have been the first to sing about Pink Cadillacs, but Gwen Stefani was a huge Mary Kay fan for as long as she can remember. The No Doubt frontwoman recently recalled for Britain's Hello! magazine how she would hang out at her best friend's house and beg her to play with her Mary Kay makeup. Later, she worked at a mall in Anaheim with dreams of becoming a counter makeup artist. She ulimately achieved her goal, with no coaching from the department store or the brand...