American singer and actress Britney Spears arrives for the premiere of her debut feature film 'Crossroads' at the Odeon in Leicester Square, London. *21/06/02 American singer and actress Britney Spears. : Pop princess Britney Spears is the most powerful celebrity on the planet, according to a poll published today, Friday 21st June 2002. The 20-year-old star topped the Forbes Global Celebrity 100 list which ranks the movers and shakers in the worlds of showbiz and sport. Spears shot up from fourth place in 2001 to take the title in the poll which takes into account earnings, website hits and media coverage.