South Park: Season 7, Episode 5 - ProjectFreeTV

7 - 5: Fat Butt and Pancake Head

Cartman dresses up his hand to look like a Jennifer Lopez puppet for a presentation on Latinos in the arts. However, after he wins an award, he keeps up the act. The puppet goes on to replace the real Jennifer Lopez, scoring a music deal and stealing her boyfriend, Ben Affleck. Naturally, this enrages Kyle.