Description: The cast of "Friends" return to the original soundstage where they filmed the series to reminisce and test their knowledge of the show against each other in the special that also includes appearances from David Beckham, Justin Bieber, BTS, James Corden, Cindy Crawford, Cara Delevingne, Lady Gaga, Elliott Gould, Kit Harington, Larry Hankin, Mindy Kaling, Thomas Lennon, Christina Pickles, Tom Selleck, James Michael Tyler, Maggie Wheeler, Reese Witherspoon and Malala Yousafzai.