is 'relocating back to Australia' to be closer to her mum, Janelle.   

 reports that Nicole and husband Keith Urban have already enrolled daughters Sunday Rose and Faith Margaret in a Southern Highlands girls' school ahead of their upcoming move from America.

According to the publication, Nicole 'wants to be closer to her ailing mum' Janelle, 80, who has a cardiac condition that 'first raised alarm bells' two years ago. 

Family time! Nicole Kidman (right) is 'relocating back to Australia' to be closer to her mother Janelle (left), who has a cardiac condition that 'first raised alarm bells' two years ago

Until now, Nicole, Keith and their daughters have been based in their Nashville home, while making several trips back to Australia to visit Janelle throughout the year. 

It is claimed that Nicole is now 'leaving nothing to chance concerning her mother' - following her father Antony Kidman's death in 2014. 

Nicole's sister Antonia and her husband Craig Marran are also said to be relocating back to Australia, after living abroad in Singapore for a decade. 

Big move! The Sunday Telegraph reports Nicole and husband Keith Urban have now enrolled daughters Sunday Rose and Faith Margaret in a Southern Highlands girls' school ahead of their upcoming move from America. Pictured: Keith, Sunday, Nicole and Faith in March 2017

On Saturday, Nicole shared a loving birthday tribute to Janelle on Instagram.

'Happy Birthday to my darling Mumma. I love you so much. This photo is so US,' wrote Nicole, as she celebrated her mother's 80th birthday. 

The two women are incredibly close, and Janelle often accompanies her famous daughter on outings and to red carpet events.

Staying local: It is claimed that Nicole is now 'leaving nothing to chance concerning her mother'. Pictured: Nicole, Janelle and niece Lucia Hawley in December 2018

In 2018, Nicole gave her mum a special mention after picking up the AACTA Award for Best Supporting Actress for her role in Boy Erased. 

'My mum has said a lot of things to me - pull your head in and get yourself up off the ground Nicole and get on with it, which is a great piece of advice,' she said, as reported by . 

'She has loved me so much.' 

Daily Mail Australia has contacted Nicole Kidman's management for comment.  

Home from home: Until now, Nicole, Keith and their daughters have been based in their Nashville home, while making trips back to Australia to visit Janelle throughout the year