Friends: The Reunion special has landed, and with it confirmation of guest stars from the world of music, film, TV and more.The one-off special for HBO Max in the US airs on May 27 and will feature musical guests including Justin Bieber, Lady Gaga, BTS alongside football legend David Beckham and Game Of Thrones star Kit Harrington.Fifteen celebrities will make cameos overall including former cast members Tom Selleck, who played Monica’s former boyfriend Richard, and Maggie Wheeler, who played