When Prince William celebrates his 30th birthday next month, he'll be receiving quite a gift.

On June 21, William will receive his half of his mother Princess Diana's estate.

Diana left behind a vast wealth when she died in 1997, including millions of pounds in cash from her divorce settlement, along with stocks and jewelery.

Her will said Princes William and Harry would each get half of her estate upon turning 30 years old.

The Daily Mail reports Prince William will inherit more than 10 million British pounds.

That's about $16 million.