Destiny's Child diva Beyonce Knowles, 19, recently named one of PEOPLE's 50 Most Beautiful for 2001, will soon debut as L'Oreal's newest hair spokesmodel, reports the Associated Press. Currently on tour with her group's Total Request Live concert tour, Knowles is really riding a wave. Destiny's Child's new album, "Survivor" sold more than 660,000, copies in its first week of release.