Prince William and his younger brother, Prince Harry, attended the Audi Polo Challenge in Ascot on Sunday, May 31, and William received many gifts for his newborn Princess Charlotte, E! News reports. 

According to E!, Andre Konsbruck, the director of Audi UK, gave Prince William a pair of newborn Hunter Wellington boots for 4-week-old Princess Charlotte.

Meanwhile, Prince Harry received a surprise of his own. Harry spoke with "Avengers" star Samuel L. Jackson who then Instagrammed the moment with his followers.

Check out Jackson's Instagram posts below.

 BTW, HRH Prince Harry was on the winning team! Met him years ago at St Andrews, good kid then, good Man now!

A photo posted by Samuel L Jackson (@samuelljackson) on May 31, 2015 at 9:49am PDT

Spectators go out at halftime & tamp the churned up grass back down! Who knew?! A photo posted by Samuel L Jackson (@samuelljackson) on May 31, 2015 at 9:40am PDT

In addition to chatting with Jackson, Prince Harry and Prince William also had the opportunity to speak with couple Chris Hemsworth and Elsa Pataky.

And like Jackson, Elsa Pataky also documented the Audi Polo challenge moment on Instagram.

Prince William's appearance at the Audi Polo Challenge comes on the heels of his decision to return to work following his brief paternity leave for the birth of Princess Charlotte, ABC News reports.

Prince Williams returned to work on Monday, June 1, after taking a month off from working as an air ambulance pilot.

According to ABC, William's month-long paternity leave was unpaid, and he reportedly spent most of his down time at his and Duchess Kate Middleton's country estate where they bonded with Charlotte and their older child Prince George who is almost 2-years-old.

The East Anglian Air website states that Williams' job as an air ambulance pilot for East Anglian Air requires him to be part of a crew that is "called to an average of four incidents per day," including "life threatening situations such as road traffic accidents and medical emergencies."

William is based at Cambridge and Norwich Airports and works both day and night shifts, flying missions in Cambridgeshire, Norfolk, Suffolk and Bedfordshire, ABC New reports.