Billie Eilish has hit out at Elon Musk for allegedly hoarding his extreme wealth.

Taking to her Instagram Stories on Thursday, the Birds of a Feather hitmaker re-shared a carousel from an account titled My Voice, My Choice, which had the headline, "Elon Musk became the world's first trillionaire here's what he could do with it."

In the accompanying slides, the content creator suggested ways the Tesla co-founder could use his money to aid people amid global crises, such as "end world hunger" and "save endangered species".

"(Elon could) choose to spend $40 billion every year to end world hunger by 2030 or provide universal safe clean water $140 billion for the planet for the next seven years," one of the slides reads.

To conclude the post, Billie wrote, "F**king pathetic p**sy b**ch coward."

Representatives for Elon have not yet responded to the Ocean Eyes hitmaker's comments.

The SpaceX entrepreneur is the world's wealthiest person, with his net worth estimated to be around $500 billion.

And last week, Tesla shareholders voted in favour of chief executive Elon receiving an almost $1 trillion pay plan.

Though the compensation plan will be required to meet a series of business goals over the next decade, should he be successful, Elon will become the world's first trillionaire.

However, the X owner is a polarising figure, and has received public backlash over serving as an advisor to U.S. President Donald Trump and launching the Department of Government Efficiency (DOGE) earlier this year.

Elon departed the administration in September following a feud with the American leader.