Justin Timberlake hosted the show and introduced acts such as Psy, Eliza Doolittle, Ellie Goulding and Lawson.
Fans of The Wanted got a happy surprise when Nathan Sykes joined the band on stage for their set. The singer has been unable to perform with the band for a while after having an operation to treat nodules on his larynx.
Former X Factor contestants James Arthur and Ella Henderson were also both present. Arthur performed his number one hit 'Impossible', while Henderson joined Labrinth on the stage for a duet.
Scroll through our gallery below to see the latest pictures from the event.