From an article in Blender Magazine, October 2004, that counted down the greatest teen moments in rock and roll history:
Sweet Little 16
BRITNEY SPEARS MAKES DEBUT VIDEO
At age 10, Britney Spears appeared as a possessed demon child in the off-Broadway production Ruthless. A year later, she successfully auditioned to be a Mouseketeer on the Mickey Mouse Club. In 1999 she combined her talents for playing angels and devils in the video for her first single "Hit Me Baby (One More Time)". Spears raunched down a high-school corridor in school girl miniskirt, bare midriff and pigtails. "I don't want to be a part of someone's Lolita thing" commented the 16 year old. The world wasn't so sure. The debut single and album achieved a unique feat: simultaneous number 1's.
Number 3 is real good given that Elvis Presley was number 2!
Source - israeli_girl at BritFugees.com