One Direction won 'Top Duo/Group' at the Billboard Music Awards 2015 and dedicated the award to their ''brother'' Zayn Malik.

Louis Tomlinson, Harry Styles, Liam Payne and Niall Horan turned up to their first awards show, held in Las Vegas' MGM Grand Garden Arena last night (17.05.15), as a four-piece, but showed there were no hard feelings towards the 22-year-old singer - who left the band in March - as they gave him a shout out during their acceptance speech.

Liam said: ''There's one more person to share this with, and that's our brother Zayn.''

Earlier this month, the 1D boys admitted they were a ''little bit angry'' when Zayn Malik told them he was quitting the group.

Liam revealed he and his bandmates were initially rocked when Zayn informed them he wanted to walk away from the globe-conquering boy band, but they anger quickly dissipated.

In their first interview as a four-piece with James Corden on 'The Late Late Show' on Thursday night (05.14.15), the 21-year-old singer said: ''At first we were a little bit angry. We were surprised, but I think we all knew the general vibe that Zayn was feeling. There were certain parts of this job that Zayn loved and certain parts of the job that he didn't. If you don't like your job, you've got to follow your heart sometimes and go where you need to go. There's no argument with that.''