The boys from Lonely Island celebrated their 100th Digital Short on Saturday Night Live last night with a musical panorama of the group's notable characters and moments. Justin Bieber filled in for an absent Akiva Schaffer, gamely joining Andy Samberg and Jorma Taccone while expressing some dismay at the anatomically improbable means by which they planned to reward themselves for the milestone. Justin Timberlake, Michael Bolton, Jon Hamm and Natalie Portman reprised their earlier roles, and Usher jumped in for some brief commentary.