Billie Eilish has hit out at Elon Musk in an expletive-filled rant on social media, describing the Tesla founder as “pathetic.”

The 23-year-old singer took to her Instagram Stories to share her thoughts on wealth and inequality after a new Tesla pay package put Musk on track to becoming the world’s first trillionaire.

The Birds of a Feather hitmaker reposted a series of slides from activist group My Voice, My Choice which suggested how the 54-year-old businessman and former advisor to Donald Trump could use his vast fortune to tackle global crises, from rebuilding Gaza to ending world hunger.

The first slide, including a photo of Musk, read, “Elon Musk became the world’s first trillionaire here’s what he could do with it.”

One of the suggestions was that he could end world hunger, with the slide saying, “Musk could choose to spend $40 billion every year to end world hunger by 2030 or provide universal safe clean water for $140 billion for the planet for the next seven years.”

Another slide said Musk could save all 10,443 Critically Endangered species by paying $1 to $2 billion annually to bring all of them down to Endangered status.

One more suggestion was that his fortune could help rebuild Gaza, with extra money allocated to also rebuilding Ukraine and Syria.

“At just $53.2 billion, Musk could rebuild Gaza and the occupied West Bank according to the EU,” the slide reads.

“Although the UN predicts this could be upwards of $70 billion for Gaza alone. If he wanted to spread the wealth, and aid further, he could also rebuild Ukraine and Syria at a cost of $793.2 billion.”

The activist group also suggested, in other slides not shared by the singer, that Musk could use $10 billion every year to vaccinate 140 million newborn babies against polio, measles and tetanus for the next 100 years, and end maternity deaths in the 120 top priority countries at a cost of $115.5 billion over the next decade.

After sharing the slides, Billie took aim at the SpaceX entrepreneur, writing, “Etc….f—— pathetic p—- b—- coward.”

Musk is the world’s wealthiest person, with his net worth estimated to be around $500 billion – and last week, Tesla shareholders voted in favor of the chief executive an almost $1 trillion pay plan.

Even though the compensation plan will be required to meet a series of business goals over the next decade, if successful, Musk has the possibility of becoming the world’s first trillionaire.

Last month, Billie used her acceptance speech at the WSJ Magazine Innovator Awards to challenge billionaires, questioning why such huge personal wealth exists while there are so many crises in the world.

While accepting the Music Innovator Award on October 29, she told the audience, “We’re in a time right now where the world is really, really bad and really dark and people need empathy and help more than, kind of, ever, especially in our country.

“I’d say if you have money, it would be great to use it for good things, maybe give it to some people that need it.”

Celebrities in attendance at the Museum of Modern Art in New York City were tech mogul Mark Zuckerberg and his wife Priscilla Chan, director Spike Lee, Rhode founder Hailey Bieber and Star Wars creator George Lucas.

Billie said, “Love you all, but there’s a few people in here that have a lot more money than me. If you’re a billionaire, why are you a billionaire? No hate, but yeah, give your money away, shorties.”

Event host Stephen Colbert announced that Billie pledged $11.5 million from her Hit Me Hard and Soft tour to charities and non-profits “dedicated to food equity, climate justice, reducing carbon pollution and combating the climate crisis.”

Stephen said, “I also have the privilege of breaking a little news tonight. Thank you, Billie, for allowing me to do this. It’s extraordinary.

“Billie Eilish will be donating proceeds from her Hit Me Hard and Soft Tour to support organizations, projects and voices dedicated to food equity, climate justice, reducing carbon pollution and combating the climate crisis.

“That donation, ladies and gentlemen, will be $11.5 million. That’s wonderful. Billie, on behalf of humans everywhere, thank you.”