Fifty seasons of ''Saturday Night Live'' sketches, songs and special guests will be celebrated Sunday as the variety show celebrates its landmark anniversary.

Meryl Streep made a NSFW gesture when the camera panned to her and Martin Short at the SNL50: The Homecoming Concert.

Nothin' but a mistake, indeed. Watch Backstreet Boys misguidedly force Jerry Seinfeld to sing the final chorus of 'I Want It ...