Cheryl Cole, Harry Styles and Rita Ora have been helping DJ Nick Grimshaw prepare for his early starts as the new host of the Radio 1 breakfast show.

Nick, who is taking the reins of the morning show after the departure of Chris Moyles, will hit the airwaves on September 24.

In a TV trail for the new show, Harry swaps his trademark curly mop for a 'Grimmy' quiff and gives Nick a crashing wake-up call. Meanwhile, Rita prepares breakfast for the DJ and Cheryl helps make sure he gets to the studio in time.

Rapper Professor Green helps Nick pick an outfit for the big day, while fellow Radio 1 star Greg James is his driver.

And former breakfast show host Sara Cox meets Nick upon his arrival at the studio, greeting him with a massive coffee to wake him up for the show.

Short teasers including the celebs have already been released, with the video featuring Harry Styles becoming one of the most popular Radio 1 videos ever, notching up 822,900 views within a week since it went online.

Chris, who hosted the show for more than eight years, got behind the microphone for the final time last week and told listeners he felt "really proud".