Celeste Barber enjoyed a soothing bed time story on Sunday night, read to her by none other than Harry Styles. 

The comedian, 39, shared a series of Instagram Stories in which she came across the pop star's contribution to the Calm app. 

'I'm Harry Styles and tonight, I'm going to help you drift off to sleep,' Harry's voice could be heard saying in a recording playing on Celeste's tablet. 

'That's... that's nice!' the Australian funnywoman said in a video clip, shocked and impressed. 

Harry helps Calm app users to sleep as he lends his voice to a 30 minutes sleep story, and his contribution has been available since last year. 

The Watermelon Sugar hitmaker, who initially invested in the company's Series A back in 2018, voices the new Dream With Me story. 

'Sleep and meditation are a huge part of my routine, whether I'm at home, in the studio, or out on the road,' the British singer said in a statement.

The 27-year-old continued to say that balance had been essential to his life.   

'Rest and recovery is as important as doing the work,' he said. 'Finding a balance has been endlessly beneficial to both my physical and mental health.'  

He added: 'It's changed my life. I'm so happy to be collaborating with Calm at a time when the world needs all the healing it can get. Treat people with kindness.' 

He joins fellow stars LeBron James, Laura Dern, Matthew McConaughey, Kelly Rowland, Lucy Liu and others, who have also lended their voices to Calm. 

Calm launched in 2012 and as of 2019 had 40 million downloads and more than one million paying subscribers. 

'Harry's voice usually electrifies audiences around the world, but his unique Sleep Story will help millions of people drift off to dreamland every night,' Calm co-founder and co-CEO Michael Acton Smith said. 

Adding: 'His mellifluous voice is the perfect tonic to calm a racing mind.'