Katy Perry
Singer-songwriter Katy Perry arrives at the Universal Music Group's 2017 Grammy after-party presented by American Airlines and Citi at the Ace Hotel, Feb. 12, 2017, in Los Angeles. Noel Vasquez/WireImage

Following the 59th annual Grammy Awards, Universal Music Group CEO and Chairman Lucian Grainge hosted Universal Music Group’s Grammy after-party at the Theatre at Ace Hotel in downtown Los Angeles.

Inside the party, Grammy-winning musicians, celebrities and Universal Music Group executives celebrated music’s biggest night. Famous faces in attendance included Katy Perry, Niall Horan, Keith Urban, Halsey, Ellen Page, Daya, Beck, Aloe Blacc, Katharine McPhee, Kat Graham, Desiigner, Mike Posner, Troye Sivan, Chord Overstreet,Glen Powell, Matt Sorum, Brothers Osborne, Afrojack, DJ Flume, Don Cheadle, Russell Simmons, Nancy Wilson, Borns, Megadeth and more.

Launch the slideshow above to see pictures from the party.