Prince William will celebrate his first Father's Day on 15 June.
The holiday falls just over a month before Prince George turns one on 22 July.
According to E! News, the 31-year-old royal and his brother, Prince Harry, will be playing polo as part of the day.
"[William] will be playing in a polo match to raise money for some of his charities," a palace source told the website.
This is "one of a number of matches [William] and his brother [Prince Harry] play in over the summer to raise money and awareness for good causes," the insider added.
As William prepares to make his first Father's Day a memorable occasion, scroll down to take a look at some of the most adorable photos of Prince William and Prince George below.