Bette Midler has pledged to donate $500,000 to the Australian bushfire relief efforts in a tweet challenging News Corp boss Rupert Murdoch.

Key points: Midler is among the growing list of celebrities donating to the bushfire relief effort

Midler is among the growing list of celebrities donating to the bushfire relief effort Music promoter Michael Gudinski says he is holding a series of Sound Relief concerts to raise money, eyeing off Elton John and Ed Sheeran as headliners

Music promoter Michael Gudinski says he is holding a series of Sound Relief concerts to raise money, eyeing off Elton John and Ed Sheeran as headliners Fleabag star Phoebe Waller-Bridge is auctioning off the Australian-made suit she wore to the Golden Globes to raise money

Midler said she would match Pink's donation, after the singer pledged $500,000 towards "the local fire services that are battling so hard on the frontlines" of the bushfire crisis.

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"I stand with you Pink," Midler said.

"I will match you, and while I'm at it, what do you think Rupert Murdoch will be doing for the country of his birth?"

Midler has been vocal about the bushfire crisis, previously criticising Prime Minister Scott Morrison's leadership in a tweet earlier this month.

The singer and actor has joined a growing list of celebrities pledging money to the bushfire relief effort.

Elton John pledged $1 million as he closed his Sydney show, with actor Chris Hemsworth and reality TV star Kylie Jenner also donating $1 million.

Members of metal band Metallica said they donated $750,000, while Formula One driver Lewis Hamilton has pledged about $730,000.

Kylie Minogue's family and Nicole Kidman and Keith Urban have each said they would donate $500,000.

Celeste Barber's fundraiser has so far attracted more than $50 million in donations.

Sound Relief eying off Elton John for concerts

Australian event promoter Michael Gudinski, who co-organised the Sound Relief concerts in 2009 to help victims of the Victorian bushfires, said he was hosting another series of concerts this year.

Speaking to ABC News, Mr Gudinski said the concerts would be staged across five cities and possibly New Zealand some time after the beginning of March.

"It's too early to tell you the line ups and everything else," he said.

"I've got no one signed up, but the two people who would be at the top of my list would be Sir Elton [John], who's spent so much time here and is just such a generous person — he's already donated a million bucks.

"And his little mate… Ed Sheeran."

Elton John is on Micheal Gudinski's wish list to perform at the Sound Relief concerts. ( AAP: Julian Smith )

Mr Gudinski also hinted at other big names, such as Kylie Minogue and Pink, without confirming the artists would make it to the final line up.

"Bruce Springsteen's management sent me a note, I know how many people love and respect that guy and how serious his music is," he said.

Fleabag star auctions suit

Actor and Fleabag creator Phoebe Waller-Bridge is auctioning off the Ralph & Russo couture tuxedo she wore to the Golden Globe Awards last week.

The Australian designers black Chantilly lace suit was custom-made for Waller-Bridge, featuring silk and a gold ribbon applique.

Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. Watch Duration: 2 minutes 34 seconds 2 m 34 s Phoebe Waller-Bridge to auction off her Golden Globes dress

Waller-Bridge signed the label, detailing the encounters the suit had with other celebrities such as Tom Hanks, Elton John and Oliva Colman in a video posted by the Fleabag Twitter account.

"Ralph and Russo are both Australian, so this cause is very, very close to their hearts," she said.

"We're raising money for charities that really, really know what they're doing so you can be rest assured that the money's going right to where it needs to go."

The money raised in the auction will be donated to the Australian Red Cross Disaster Relief and Recovery Fund, Wildlife Rescue Emergency Fund (WIRES) and Wildlife Victoria.

Bids are open for the suit on eBay, with the auction closing on January 20.

#AuthorsForFireys expected to raise 'hundreds of thousands'

Authors Nova Weetman and Emily Gayle sparked their own online movement when they launched the #AuthorsForFireys campaign on Twitter, which saw authors and publishers around the country auction off "signed books, illustrations, unique experiences, one-off opportunities and writers' services" with proceeds going to back to firefighters.

Bids closed at 11pm on January 11, with Weetman saying the response had been beyond anything she or Gayle had imagined.

"From the hundreds of people listing items to the thousands of people posting bids, it has been the most joyful fundraiser," she said..

"It hasn't just made money for the brave volunteer firefighters facing the worst fires this country has ever seen, it has bought people together.

"Book people typically don't have lots of money to donate, so this has been a great way for everyone to feel like they could give something. Big or small.

"Bids have been placed on everything from the smallest offering to Nick Cave's suit."

Early fundraising targets have already been blown out of the water, but the authors said it would take some time to count up exactly how much the initiative has raised.

"To estimate the total amount made is really tricky. We started off aiming for $13,000," Weetman said.

"Obviously that was almost broken with one winning item — several have gone for $10,000 — so a very rough estimate is somewhere in the hundreds of thousands.

"The other lovely aspect to this has been that all sorts of new relationships have been forged. Bidders have buddied up to bid collectively, new authors have met established authors, and Twitter has been a place of kindness, generosity and compassion — a rare thing indeed."