I liked smarthouse, what if and the feud with two artists episode. I don't know if yu know Hey Arnold, but it reminds me the partners episode, which was great
1) Thank you!
2) Yes, I know about "Hey Arnold", though I haven't seen it so much (perhaps, I was too young, when it translates in my country).
3) Now the most closer what you said, I had was "Stars War" episode - feud between two celebrities. But maybe, later I come to something about it.