Fey, a former "SNL" cast member and head writer, is to return for a third time as host May 7, when Goulding makes her musical guest debut.
Helms is to serve as "SNL" host for the first time May 14, when Simon makes his eighth appearance as musical guest.
Timberlake will return for his fourth time as host May 21, the night of the sketch comedy show's season finale. Lady Gaga is to perform during the episode.
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