Katy Perry, Sam Smith and Lucian Grainge

Katy Perry and Sam Smith join UMG chairman & CEO Lucian Grainge at the Universal Music Group 2015 Grammy After-Party presented by American Airlines and Citi on February 8. Perry arrived with celeb stylist Johnny Wujek (not on-again beau John Mayer), and stayed for about an hour, chatting inside with newly anointed Grammy winner Beck. Another big winner, Sam Smith, was barraged by well-wishers, and endearingly exclaimed to a friend, “I can’t believe it. I was just like, what the f–k?!” Smith stopped to give Paris Hilton a hug, before heading out of the Theatre at Ace Hotel and over to his private after-party (presented by Hanger 1 Vodka and Dobel Tequila at a Bel Air estate, where Perry, Taylor Swift, Ed Sheeran, Hozier and more hung).