If you do a Fame EP, do it like Superstar.
The Sims 1: Superstar's celebrity system was the most fun in the entire series. You could become an Actor and actually see your Sim act, a Singer and record Songs in the studio or film music videos or become a Model and serve looks at the catwalk.
One your Sim reached a certain star level, your Sim's life would drastically change. There were paparazzi's roaming through your trash you needed the take care of and fanatic fans giving you presents, wanting autographs or falling into a coma after seeing your Sim.
It almost felt like a Famous Sim was a new life state like a vampire for example, and that was fun!
We had another celebrity system in TS3, but that was basically by getting to know famous people and then spreading the "fame virus" to everyone else. Not really fun at all.