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Niall HoranSelf - Musical Guest
Harry StylesSelf - Musical Guest
Fred ArmisenSelf - Cameo (uncredited)
Paul RuddSelf - Host
Louis TomlinsonSelf - Musical Guest
Liam PayneSelf - Musical Guest
Zayn MalikSelf - Musical Guest
Kristen WiigSelf - Cameo (uncredited)
Will FerrellSelf - Cameo (uncredited)
David KoechnerSelf - Cameo (uncredited)
Steve CarellSelf - Cameo (uncredited)
