"The Sims: Superstar is the sixth expansion pack of the seven released for The Sims. This expansion allows the player's Sims to become entertainment figures and includes representations of several famous personalities. They can then impersonate several great stars, like Elvis Presley, Marilyn Monroe, Madonna, Christina Aguilera, The Beatles, Richie Sambora, Avril Lavigne etc. A few selected items such as the performing stage from this expansion pack were re-introduced to the sequel via The Sims 2: Apartment Life."
Source: Wikipedia, "The_Sims," available under the CC-BY-SA License.