Saturday Night Live celebrated a momentous landmark this weekend: their 100th Digital Short. Honoring this special event a star-studded cast was invited. Justin Bieber joined the party as the fellas took a trip down memory lane, taking a look at some of their memorable digital short moments from the past, from Justin Timberlake‘s appearances to Will Ferrell, Lady Gaga, Natalie Portman and Jon Hamm. Usher popped in to note he’d never been in a digital short, before Will Ferrell crashed the party to brag about his impressive SNL record. Watch the "celebration" above.