The biggest stars of the '90s turned out to salute Teen PEOPLE: see the epic throwback photos SGranitz/WireImage On Jan. 6, 1999, a who's-who of pop stars and other celebs gathered to salute Teen ...

On Jan. 6, 1999, a who's-who of pop stars and other celebs gathered to salute Teen PEOPLE's 1st anniversary. With her 1998 debut single "...Baby One More Time" burning up the charts, Britney Spears ...

On Jan. 6, 1999, a who's-who of pop stars and other celebs gathered to salute Teen PEOPLE's 1st anniversary. The star-studded bash at the Key Club in Los Angeles boasted an impressive guest list that ...