Yes, George Michael! Do you think it is generational though? I can think of plenty of icons from the 50s and 60s that were before my time. Maybe the 90s and 2000s were just flat times for music.
Mariah Carey, Jennifer Lopez, TakeThat, Britney Spears. All 90s stars and all still going strong. I hope Lady GaGa will keep going; think she stands a better chance than many because she changes her style a fair bit.