India, Dec. 16 -- Singer-actor Lily Allen, 40, made a surprise return to Saturday Night Live on December 13 , appearing as the musical guest for the first time in nearly two decades. She performed two songs from her latest album, West End Girl: Sleepwalking and Madeline. During Madeline, actor Dakota Johnson, 36, delighted the live audience with a surprise cameo towards the end, standing behind Lily before kissing her on the cheek. HTC...