Ash Barty is the latest famous voice to pledge support for firefighting efforts across Australia, promising to donate any prize money she earns from next week's Brisbane International.

If the world number one makes it all the way and wins the tournament's final that would mean a donation of $382,000 to the Red Cross.

Key points: The Duke and Duchess of Sussex have posted on Instagram their support for firefighting efforts

The Duke and Duchess of Sussex have posted on Instagram their support for firefighting efforts Meanwhile, a joint ABC-Red Cross appeal has raised millions for bushfire relief

Meanwhile, a joint ABC-Red Cross appeal has raised millions for bushfire relief Nicole Kidman and Pink are among the famous names behind large donations

Earlier, the Duke and Duchess of Sussex said they were "personally connected" to the NSW communities it visited last year, as well as other regions experiencing "environmental disasters".

"The global environmental crisis has now been described as Ecocide. It's easy to feel helpless, but there's always a way to help," they wrote in an Instagram post.

The post included links to the Red Cross, NSW Rural Fire Service and Victorian Country Fire Authority.

Actor Nicole Kidman said on Instagram she had donated $500,000 to the rural fire services and posted links to various bushfire organisations for donations.

"Our family's support, thoughts and prayers are with everyone affected by the fires all over Australia," she said.

Nicole Kidman and husband Keith Urban have donated $500,000. ( Instagram: Nicole Kidman )

American pop star Pink, who regularly tours Australia, donated $500,000.

She told her 32 million Twitter followers she was "totally devastated watching what is happening in Australia right now".

She said her donation would go to local fire services on the front lines and encouraged others to give what they could.

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Comedian Celeste Barber appealed to her thousands of social media followers to donate to the NSW Rural Fire Service on Friday and donations have now soared past $20 million.

Barber had posted images of her mother-in-law's house, under a red glow, at Eden on the NSW South Coast.

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Australia's deadly bushfire crisis has made international headlines, and help is coming in all shapes and sizes.

The ABC's joint Disaster Relief and Recovery Appeal with the Australian Red Cross, launched on New Year's Eve, has now raised more than $19 million for bushfire-affected communities.

The donation drive will fund disaster relief and recovery programs, including support for people at evacuation centres and cash grants for those who have lost homes in the bushfires.

Even tennis bad boy Nick Kyrgios — who became emotional when asked about the fires after his ATP Cup victory last night — is chipping in $200 for every ace he sends down this summer.

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But it's not just cash being offered.

Sydney man Nathan Roberts said he would take his excavator around the state on his Christmas break to help those affected by fires to clean up.

"I'm offering to take and help those in need of cleaning up their properties or communities after these fires have gone through," he posted on Facebook.

"I have the next week off work and am willing to travel as far down as Batemans Bay area. Let's help each other out and get the job done."

His offer has been shared nearly 20,000 times.

In the UK, this tweet by Robert John Jackson is offering up pure people power.

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In Canberra, a Facebook group laden with offers of emergency accommodation, items and aid is aiming to make life a little easier for those devastated by fires which continue to rage in southern NSW.

Donations from bare necessities like food and water to other helpful goods like washing machines and even beds have inundated The Bushfire Emergency Accommodation in Canberra Facebook group.

In just two days, its membership has surged past 6,000.

In Bega, a note fastened to an electrical pole on the town's main street offers beds to those in need.

Sue Flood and her partner put up the sign after they were able to house six adults, six kids and two dogs who were preparing to sleep in the carpark underneath their house on New Year's Eve.

"You see people with kids in this horrible smoke … so we wanted to give the option and say there's bedrooms, there's mattresses, and that we've got the space," she said.

"From what I've seen there are a lot of people offering up help."