Spawn-Off: Noun. A person nearly indistinguishable in character and style as the original in a trend - a la TV Spin-off. I.E. Britney Spears spawn offs include Hanna Montana and Hilary Duff.
BFF#1 Did you see David Archuleta on American Idol last year?
BFF#2 Yeah, and he already has a spawn-off... Justin Beiber.