Fey, a former "SNL" cast member and writer, is to return to the sketch comedy series April 10 when teen singing sensation Justin Bieber is scheduled to be the musical guest.
Phillippe, whose film credits include "Gosford Park," "Crash" and the upcoming "MacGruber," is to make his debut as "SNL" guest host April 17. Recording artist Ke$ha has been booked to perform that evening.
Oscar-nominated "Precious" star Sidibe is to serve as host on the April 24 installment of "SNL." The musical guest that night is MGMT, NBC said.