Because Kevin Federline (also Britney Spears's rodent-like ex-husband) is doing three episodes where he plays a struggling musician whom one of the characters will try to help.
Bleck.
He is a terrible rapper, father, person and actor.
In other more important and far better news the rumors about celebrity pregnancies today include Jenny McCarthy and Jim Carey. The couple have been seeing each other for several years now and Jenny is constantly gushing about how great Jim is with her son. Wowzers! I'm excited for thems if this is true.